rename: compare_string_array -> index_in_str_array

introduce index_in_substr_array and use it in
iproute2

networking/ip.c

@@ -12,20 +12,11 @@
  * Rani Assaf <rani@magic.metawire.com> 980929:	resolve addresses
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <syslog.h>
-#include <fcntl.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <string.h>
+#include "busybox.h"
 
 #include "libiproute/utils.h"
 #include "libiproute/ip_common.h"
 
-#include "busybox.h"
-
 int ip_main(int argc, char **argv)
 {
 	int ret = EXIT_FAILURE;
@@ -57,5 +48,5 @@ int ip_main(int argc, char **argv)
 	if (ret) {
 		bb_show_usage();
 	}
-	return(EXIT_SUCCESS);
+	return EXIT_SUCCESS;
 }