ifplugd: close signal race

function                                             old     new   delta
ifplugd_main                                        1109    1117      +8

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

networking/ifplugd.c

@@ -686,6 +686,8 @@ int ifplugd_main(int argc UNUSED_PARAM, char **argv)
 			goto exiting;
 		default:
 			bb_got_signal = 0;
+		/* do not clear bb_got_signal if already 0, this can lose signals */
+		case 0:
 			break;
 		}