improve readability of string: fix indentation and remove trailing spaces

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>

libc/string/strcoll.c

@@ -36,5 +36,5 @@
 int
 strcoll(const char *s1, const char *s2)
 {
-	return strcmp (s1, s2);
+	return strcmp(s1, s2);
 }

libc/string/strncmp.c

@@ -38,7 +38,6 @@
 int
 strncmp(const char *s1, const char *s2, size_t n)
 {
-
 	if (n == 0)
 		return (0);
 	do {