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svn:author
V 7
git2svn
K 8
svn:date
V 27
2022-07-29T17:09:15.049777Z
K 7
svn:log
V 550
Suppress unused variable warning in if_mwl.c

With clang 15, the following -Werror warning is produced:

    sys/dev/mwl/if_mwl.c:3445:8: error: variable 'ix' set but not used [-Werror,-Wunused-but-set-variable]
            u_int ix;
                  ^

Here, 'ix' is a variable that is only used when debugging. Mark the
variable as potentially unused, to suppress the warning.

MFC after:	3 days

(cherry picked from commit 52c80d495a1b9dc756452ebcbb945906ea3cf23a)

Git Hash:   3a5a2ecda091ce7dd4a89857620cec72f41ee007
Git Author: dim@FreeBSD.org
END