iwinfo: fix compilation error with GCC 12
Fix compilation error with GCC 12.
In file included from /home/ansuel/openwrt/staging_dir/target-aarch64_cortex-a53_musl/usr/include/libubus.h:23,
from iwinfo.c:21:
In function 'blobmsg_close_array',
inlined from 'rpc_iwinfo_assoclist' at iwinfo.c:643:3:
/home/ansuel/openwrt/staging_dir/target-aarch64_cortex-a53_musl/usr/include/libubox/blobmsg.h:250:9: error: 'c' may be used uninitialized [-Werror=maybe-uninitialized]
250 | blob_nest_end(buf, cookie);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
iwinfo.c: In function 'rpc_iwinfo_assoclist':
iwinfo.c:564:15: note: 'c' was declared here
564 | void *c, *d, *e;
| ^
cc1: all warnings being treated as errors
ninja: build stopped: subcommand failed.
Signed-off-by: Christian 'Ansuel' Marangi <ansuelsmth@gmail.com>