Changed error message for incompatible 2.6.4 pre-release versions.

sender.c

@@ -178,8 +178,8 @@ int read_item_attrs(int f_in, int f_out, int ndx, uchar *type_ptr,
 		extern int am_sender;
 		if (!am_sender || !(iflags & (ITEM_LOCAL_CHANGE|ITEM_TRANSFER))) {
 			rprintf(FERROR,
-				"The %s side is running 2.6.4pre[12] -- upgrade it or use --protocol=28!\n",
-				am_sender ? "receiving" : "sending");
+				"Incompatible 2.6.4 pre-release on %s -- upgrade it or use --protocol=28!\n",
+				am_sender ? "receiver" : "sender");
 			exit_cleanup(RERR_PROTOCOL);
 		}
 		iflags &= ~ITEM_DUMMY_BIT;