lib/zlib: add missing MODULE_DESCRIPTION() macro

With ARCH=csky, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/zlib_deflate/zlib_deflate.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Link: https://lkml.kernel.org/r/20240613-md-csky-lib-zlib_deflate-v1-1-83504d9a27d6@quicinc.comSigned-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Cc: Guo Ren <guoren@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

lib/zlib_deflate/deflate_syms.c

@@ -17,4 +17,5 @@ EXPORT_SYMBOL(zlib_deflate);
 EXPORT_SYMBOL(zlib_deflateInit2);
 EXPORT_SYMBOL(zlib_deflateEnd);
 EXPORT_SYMBOL(zlib_deflateReset);
+MODULE_DESCRIPTION("Data compression using the deflation algorithm");
 MODULE_LICENSE("GPL");