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[libc] Fix memcmp return value

--- a/libc/src/memcmp.c

+++ b/libc/src/memcmp.c

@@ -7,7 +7,7 @@

 {

 	char *s = (char *) s1, *t = (char *) s2;

-	while (n > 0 && *s++ != *t++)

-		--n;

-	return n != 0;

+	while (n > 0 && *s == *t)

+		--n, ++s, ++t;

+	return n ? (*s - *t) : 0;

 }