ping plugin: Let start_thread() return gracefully when thread is already running.

Signaling an error caused the init function to signal an error, causing
the read callback to be unregistered on systems where init is called
more than once.

Fixes: #869

diff --git a/src/ping.c b/src/ping.c
index ecbbd9d0f32960b0174f350fe003fe68a8e5ce51..fca730f5e7698bb56e169b8559c036f81e424c3e 100644 (file)
--- a/src/ping.c
+++ b/src/ping.c
@@ -374,7 +374,7 @@ static int start_thread (void) /* {{{ */
   if (ping_thread_loop != 0)
   {
     pthread_mutex_unlock (&ping_lock);
-    return (-1);
+    return (0);
   }
 
   ping_thread_loop = 1;
@@ -388,7 +388,7 @@ static int start_thread (void) /* {{{ */
     pthread_mutex_unlock (&ping_lock);
     return (-1);
   }
-    
+
   pthread_mutex_unlock (&ping_lock);
   return (0);
 } /* }}} int start_thread */
@@ -439,10 +439,7 @@ static int ping_init (void) /* {{{ */
         "Will use a timeout of %gs.", ping_timeout);
   }
 
-  if (start_thread () != 0)
-    return (-1);
-
-  return (0);
+  return (start_thread ());
 } /* }}} int ping_init */
 
 static int config_set_string (const char *name, /* {{{ */