kunit: slub: add module description

Modules without a description now cause a warning:

WARNING: modpost: missing MODULE_DESCRIPTION() in lib/tests/slub_kunit.o

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 6c6c1fc09de3 ("modpost: require a MODULE_DESCRIPTION()")
Signed-off-by: Arnd Bergmann <[e-mail]>
Cc: Guenetr Roeck <[e-mail]>
Cc: Jeff Johnson <[e-mail]>
Cc: Masahiro Yamada <[e-mail]>
Cc: Pei Xiao <[e-mail]>
Cc: Rae Moar <[e-mail]>
Cc: Stehen Rothwell <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/tests/slub_kunit.c

···
 };
 kunit_test_suite(test_suite);
 
+MODULE_DESCRIPTION("Kunit tests for slub allocator");
 MODULE_LICENSE("GPL");