xvba_video_glx.c: Various fixes

- fix error path in create_hw_image_glx()

src/xvba_video_glx.c

@@ -175,6 +175,8 @@ static void *render_thread(void *arg)
        XXX: this assumes the Catalyst driver can still share GLX
        contexts from another Display struct, though actually the very
        same underlying X11 display (XDisplayString() shall match). */
+    XInitThreads();
+
     Display *x11_dpy;
     x11_dpy = XOpenDisplay(driver_data->x11_dpy_name);
     if (!x11_dpy) {
@@ -382,8 +384,10 @@ create_hw_image_glx(
         ASSERT(shader_fp_length > 0);
 
         hwi->shader = gl_create_shader_object(shader_fp, shader_fp_length);
-        if (!hwi->shader)
+        if (!hwi->shader) {
+            destroy_hw_image_glx(driver_data, obj_image);
             return VA_STATUS_ERROR_OPERATION_FAILED;
+        }
     }
 
     hwi->width  = obj_image->xvba_width;
@@ -401,6 +405,8 @@ commit_hw_image_glx(
 )
 {
     object_image_glx_p const hwi = obj_image->hw.glx;
+    if (!hwi)
+        return VA_STATUS_ERROR_OPERATION_FAILED;
 
     const int is_I420 = obj_image->image.format.fourcc == VA_FOURCC('I','4','2','0');
     unsigned int offsets[3];