drivers/dstate.c: do not add whitespace on lone alarm [networkupstools#2931]

Signed-off-by: desertwitch <[email protected]>

Author: desertwitch

drivers/dstate.c

@@ -1842,7 +1842,11 @@ void status_commit(void)
 	}
 
 	if (alarm_active || alarm_legacy_status) {
-		dstate_setinfo("ups.status", "ALARM %s", status_buf);
+		if (*status_buf != '\0') {
+			dstate_setinfo("ups.status", "ALARM %s", status_buf);
+		} else {
+			dstate_setinfo("ups.status", "ALARM");
+		}
 	} else {
 		dstate_setinfo("ups.status", "%s", status_buf);
 		alarm_legacy_status = 0; /* just to be sure */