udhcp: reuse strings

text	   data	    bss	    dec	    hex	filename
1019916	    559	   5020	1025495	  fa5d7	busybox_old
1019906	    559	   5020	1025485	  fa5cd	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/udhcp/dhcpc.c

@@ -1655,8 +1655,10 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
 		}
 
 		if (packet.xid != xid) {
-			log1("xid %x (our is %x), ignoring packet",
-				(unsigned)packet.xid, (unsigned)xid);
+			log1("xid %x (our is %x)%s",
+				(unsigned)packet.xid, (unsigned)xid,
+				", ignoring packet"
+			);
 			continue;
 		}