libiproute: rename invarg(a,b) to invarg_1_to_2(a,b)

invarg(a,b) - "invalid argument", but how a and b enter the message?

invarg_1_to_2(a,b) is somewhat easier to read: "invalid argument 'a' to 'b'"

Audit of usage revealed a number of bad uses, with too long messages.

   text	   data	    bss	    dec	    hex	filename
 938848	    932	  17448	 957228	  e9b2c	busybox_old
 938788	    932	  17448	 957168	  e9af0	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/libiproute/ipaddress.c b/networking/libiproute/ipaddress.c
index 8845cab..c0f27c7 100644
--- a/networking/libiproute/ipaddress.c
+++ b/networking/libiproute/ipaddress.c
@@ -455,7 +455,7 @@
 			G_filter.scopemask = -1;
 			if (rtnl_rtscope_a2n(&scope, *argv)) {
 				if (strcmp(*argv, "all") != 0) {
-					invarg(*argv, "scope");
+					invarg_1_to_2(*argv, "scope");
 				}
 				scope = RT_SCOPE_NOWHERE;
 				G_filter.scopemask = 0;
@@ -669,7 +669,7 @@
 		} else if (arg == 5) { /* scope */
 			uint32_t scope = 0;
 			if (rtnl_rtscope_a2n(&scope, *argv)) {
-				invarg(*argv, "scope");
+				invarg_1_to_2(*argv, "scope");
 			}
 			req.ifa.ifa_scope = scope;
 			scoped = 1;
@@ -751,7 +751,7 @@
 	if (*argv) {
 		cmd = index_in_substrings(commands, *argv);
 		if (cmd < 0)
-			invarg(*argv, applet_name);
+			invarg_1_to_2(*argv, applet_name);
 		argv++;
 		if (cmd <= 4) {
 			return ipaddr_modify(