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/utils.c b/networking/libiproute/utils.c
index 37b5311..7f7cb42 100644
--- a/networking/libiproute/utils.c
+++ b/networking/libiproute/utils.c
@@ -47,7 +47,7 @@
 			return res;
 		}
 	}
-	invarg(arg, errmsg); /* does not return */
+	invarg_1_to_2(arg, errmsg); /* does not return */
 }
 
 uint32_t get_u32(char *arg, const char *errmsg)
@@ -62,7 +62,7 @@
 			return res;
 		}
 	}
-	invarg(arg, errmsg); /* does not return */
+	invarg_1_to_2(arg, errmsg); /* does not return */
 }
 
 uint16_t get_u16(char *arg, const char *errmsg)
@@ -77,7 +77,7 @@
 			return res;
 		}
 	}
-	invarg(arg, errmsg); /* does not return */
+	invarg_1_to_2(arg, errmsg); /* does not return */
 }
 
 int get_addr_1(inet_prefix *addr, char *name, int family)
@@ -230,12 +230,12 @@
 
 void incomplete_command(void)
 {
-	bb_error_msg_and_die("command line is not complete, try option \"help\"");
+	bb_error_msg_and_die("command line is not complete, try \"help\"");
 }
 
-void invarg(const char *arg, const char *opt)
+void invarg_1_to_2(const char *arg, const char *opt)
 {
-	bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
+	bb_error_msg_and_die(bb_msg_invalid_arg_to, arg, opt);
 }
 
 void duparg(const char *key, const char *arg)