s390/module: avoid using strncmp with hardcoded length

Reuse str_has_prefix instead of strncmp with hardcoded length to
make the intent of a comparison more obvious.
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/kernel/module.c

@@ -472,11 +472,11 @@ int module_finalize(const Elf_Ehdr *hdr,
 			apply_alternatives(aseg, aseg + s->sh_size);
 
 		if (IS_ENABLED(CONFIG_EXPOLINE) &&
-		    (!strncmp(".s390_indirect", secname, 14)))
+		    (str_has_prefix(secname, ".s390_indirect")))
 			nospec_revert(aseg, aseg + s->sh_size);
 
 		if (IS_ENABLED(CONFIG_EXPOLINE) &&
-		    (!strncmp(".s390_return", secname, 12)))
+		    (str_has_prefix(secname, ".s390_return")))
 			nospec_revert(aseg, aseg + s->sh_size);
 	}