scripts/kallsyms: remove unneeded length check for prefix matching

l <= strlen(sym_name) is unnecessary for prefix matching.
strncmp() will do.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/kallsyms.c

@@ -246,8 +246,7 @@ static int symbol_valid(struct sym_entry *s)
 	for (i = 0; special_prefixes[i]; i++) {
 		int l = strlen(special_prefixes[i]);
 
-		if (l <= strlen(sym_name) &&
-		    strncmp(sym_name, special_prefixes[i], l) == 0)
+		if (strncmp(sym_name, special_prefixes[i], l) == 0)
 			return 0;
 	}