makedevs: don't call /bin/sync after creating nodes

Closes #3475

There's no real reason to sync after creating the device nodes,
and it slows down the file system image creating quite a lot on
busy systems, so get rid of it.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/makedevs/makedevs.c

@@ -536,8 +536,5 @@ loop:
 	}
 	fclose(table);
 
-	if (system("/bin/sync"))
-		bb_error_msg("sync failed, continuing anyway");
-
 	return 0;
 }