Really ignore option -a.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4207 7894878c-1315-0410-8ee3-d5d059ff63e0

prog/sensors/main.c

@@ -203,6 +203,9 @@ int main (int argc, char *argv[])
     case 'u':
       do_unknown = 1;
       break;
+    case 'a':
+      /* Ignore for compatibility */
+      break;
     default:
       fprintf(stderr,"Internal error while parsing options!\n");
       exit(1);