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>

findutils/find.c

@@ -882,7 +882,7 @@ static int find_type(const char *type)
 		mask = S_IFSOCK;
 
 	if (mask == 0 || type[1] != '\0')
-		bb_error_msg_and_die(bb_msg_invalid_arg, type, "-type");
+		bb_error_msg_and_die(bb_msg_invalid_arg_to, type, "-type");
 
 	return mask;
 }