[linux-next:master 2763/5417] drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c:74:24: error: variable 'len' set but not used

[linux-next:master 2763/5417] drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c:74:24: error: variable 'len' set but not used

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   6d9bd4ad4ca08b1114e814c2c42383b8b13be631
commit: 9cf6d7f2c5549b47e0dbf09fd64557a4a69cbd28 [2763/5417] brcmfmac: of: Use devm_kstrdup for board_type & check for errors
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20220214/202202140726.ktvzMGFl-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=9cf6d7f2c5549b47e0dbf09fd64557a4a69cbd28
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 9cf6d7f2c5549b47e0dbf09fd64557a4a69cbd28
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

Note: the linux-next/master HEAD 6d9bd4ad4ca08b1114e814c2c42383b8b13be631 builds fine.
      It may have been fixed somewhere.

All errors (new ones prefixed by >>):

   drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c: In function 'brcmf_of_probe':
>> drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c:74:24: error: variable 'len' set but not used [-Werror=unused-but-set-variable]
      74 |                 int i, len;
         |                        ^~~
   cc1: all warnings being treated as errors


vim +/len +74 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c

1a3ac5c651a0c8 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Shawn Guo        2021-04-17  60  
e457a8a01a1927 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Rafał Miłecki    2017-01-07  61  void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
e457a8a01a1927 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Rafał Miłecki    2017-01-07  62  		    struct brcmf_mp_device *settings)
61f663dfc1a091 drivers/net/wireless/brcm80211/brcmfmac/of.c          Chen-Yu Tsai     2014-06-29  63  {
e457a8a01a1927 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Rafał Miłecki    2017-01-07  64  	struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio;
0ad4b55b2f2978 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Hans de Goede    2018-10-10  65  	struct device_node *root, *np = dev->of_node;
61f663dfc1a091 drivers/net/wireless/brcm80211/brcmfmac/of.c          Chen-Yu Tsai     2014-06-29  66  	int irq;
1a3ac5c651a0c8 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Shawn Guo        2021-04-17  67  	int err;
61f663dfc1a091 drivers/net/wireless/brcm80211/brcmfmac/of.c          Chen-Yu Tsai     2014-06-29  68  	u32 irqf;
61f663dfc1a091 drivers/net/wireless/brcm80211/brcmfmac/of.c          Chen-Yu Tsai     2014-06-29  69  	u32 val;
61f663dfc1a091 drivers/net/wireless/brcm80211/brcmfmac/of.c          Chen-Yu Tsai     2014-06-29  70  
0ad4b55b2f2978 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Hans de Goede    2018-10-10  71  	/* Set board-type to the first string of the machine compatible prop */
0ad4b55b2f2978 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Hans de Goede    2018-10-10  72  	root = of_find_node_by_path("/");
0ad4b55b2f2978 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Hans de Goede    2018-10-10  73  	if (root) {
29e354ebeeecae drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c Matthias Brugger 2020-07-01 @74  		int i, len;

:::::: The code at line 74 was first introduced by commit
:::::: 29e354ebeeecaee979e6fe22cd6272682d7552c9 brcmfmac: Transform compatible string for FW loading

:::::: TO: Matthias Brugger <mbrugger@suse.com>
:::::: CC: Kalle Valo <kvalo@codeaurora.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org