[Linux] Mark GLib source as removed when exiting callback

Fixes project-chip#22840

src/platform/Linux/bluez/Helper.cpp

@@ -401,7 +401,16 @@ static gboolean BluezCharacteristicWriteFD(GIOChannel * aChannel, GIOCondition a
     isSuccess = true;
 
 exit:
-    return isSuccess ? TRUE : FALSE;
+    if (!isSuccess && (conn != nullptr))
+    {
+        // Returning G_SOURCE_REMOVE from the source callback removes the source
+        // object from the context. In order not to trigger GLib critical warning
+        // when manually removing the source in BluezOTConnectionDestroy() unset
+        // self source ID tag.
+        conn->mC1Channel.mWatch = 0;
+    }
+
+    return isSuccess ? G_SOURCE_CONTINUE : G_SOURCE_REMOVE;
 }
 
 static void Bluez_gatt_characteristic1_complete_acquire_write_with_fd(GDBusMethodInvocation * invocation, int fd, guint16 mtu)
@@ -417,6 +426,7 @@ static void Bluez_gatt_characteristic1_complete_acquire_write_with_fd(GDBusMetho
 
 static gboolean bluezCharacteristicDestroyFD(GIOChannel * aChannel, GIOCondition aCond, gpointer apClosure)
 {
+    conn->mC2Channel.mWatch = 0;
     return G_SOURCE_REMOVE;
 }