lib/test_kmod: add missing MODULE_DESCRIPTION() macro

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_kmod.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Link: https://lkml.kernel.org/r/20240531-md-lib-test_kmod-v1-1-fdf11bc6095e@quicinc.comSigned-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

lib/test_kmod.c

@@ -1223,4 +1223,5 @@ static void __exit test_kmod_exit(void)
 module_exit(test_kmod_exit);
 
 MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
+MODULE_DESCRIPTION("kmod stress test driver");
 MODULE_LICENSE("GPL");