xvba_video_glx.c: split check for if-clause

The boolean operator || requires an evaluation of both expressions.
If the expressions evaluates pointers, then care must be taken that
both expressions have valid pointer. In this case it cannot be guaranteed,
thus splitting the check is needed.

src/xvba_video_glx.c

@@ -286,10 +286,13 @@ static void destroy_hw_image_glx(
 {
     unsigned int i;
 
-    if (!obj_image || !obj_image->hw.glx)
+    if (!obj_image)
+        return;
+    if (!obj_image->hw.glx)
         return;
 
     object_image_glx_p const hwi = obj_image->hw.glx;
+    ASSERT(hwi);
 
     if (hwi->num_textures > 0) {
         glDeleteTextures(hwi->num_textures, hwi->textures);
@@ -430,9 +433,9 @@ commit_hw_image_glx(
 }
 
 const HWImageHooks hw_image_hooks_glx = {
-    create_hw_image_glx,
-    destroy_hw_image_glx,
-    commit_hw_image_glx
+    .create = create_hw_image_glx,
+    .destroy = destroy_hw_image_glx,
+    .commit = commit_hw_image_glx
 };
 
 // Render subpictures