More checks for current GF state were added.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403606

src/video/qnxgf/SDL_gf_input.c

@@ -262,6 +262,10 @@ int gf_showcursor(SDL_Cursor* cursor)
       {
          mdata=(SDL_MouseData*)cursor->mouse->driverdata;
          didata=(SDL_DisplayData*)mdata->didata;
+         if ((didata==NULL) || (mdata==NULL))
+         {
+            return;
+         }
       }
       else
       {
@@ -405,6 +409,10 @@ void gf_movecursor(SDL_Cursor* cursor)
    if (window_id<=0)
    {
       didata=(SDL_DisplayData*)cursor->mouse->driverdata;
+      if (didata==NULL)
+      {
+         return;
+      }
    }
    else
    {

src/video/qnxgf/SDL_qnxgf.c

@@ -208,6 +208,7 @@ static void qnxgf_destroy(SDL_VideoDevice* device)
    if (gfdata->gfinitialized!=SDL_FALSE)
    {
       gf_dev_detach(gfdata->gfdev);
+      gfdata->gfdev=NULL;
    }
 
    if (device->driverdata!=NULL)
@@ -529,7 +530,7 @@ int qnxgf_videoinit(_THIS)
 
 void qnxgf_videoquit(_THIS)
 {
-   SDL_DisplayData* didata;
+   SDL_DisplayData* didata=NULL;
    uint32_t it;
 
    /* Stop collecting mouse events */
@@ -546,10 +547,12 @@ void qnxgf_videoquit(_THIS)
       if (didata->cursor.cursor.bitmap.image0!=NULL)
       {
          SDL_free((void*)didata->cursor.cursor.bitmap.image0);
+         didata->cursor.cursor.bitmap.image0=NULL;
       }
       if (didata->cursor.cursor.bitmap.image1!=NULL)
       {
          SDL_free((void*)didata->cursor.cursor.bitmap.image1);
+         didata->cursor.cursor.bitmap.image1=NULL;
       }
 
       /* Free main surface */
@@ -581,6 +584,7 @@ void qnxgf_videoquit(_THIS)
 
          /* Detach from layer, free it for others */
          gf_layer_detach(didata->layer);
+         didata->layer=NULL;
 
          /* Mark it as detached */
          didata->layer_attached=SDL_FALSE;
@@ -588,6 +592,7 @@ void qnxgf_videoquit(_THIS)
 
       /* Detach from selected display */
       gf_display_detach(didata->display);
+      didata->display=NULL;
    }
 }