plugins: fix code style for errors

https://bugzilla.gnome.org/show_bug.cgi?id=773497

gst/vaapi/gstvaapiencode_h264.c

@@ -341,9 +341,11 @@ _h264_convert_byte_stream_to_avc (GstBuffer * buf)
   return TRUE;
 
 error:
+  {
     gst_buffer_unmap (buf, &info);
     return FALSE;
   }
+}
 
 static GstFlowReturn
 gst_vaapiencode_h264_alloc_buffer (GstVaapiEncode * base_encode,

gst/vaapi/gstvaapiencode_h265.c

@@ -340,9 +340,11 @@ _h265_convert_byte_stream_to_hvc (GstBuffer * buf)
   return TRUE;
 
 error:
+  {
     gst_buffer_unmap (buf, &info);
     return FALSE;
   }
+}
 
 static GstFlowReturn
 gst_vaapiencode_h265_alloc_buffer (GstVaapiEncode * base_encode,

gst/vaapi/gstvaapisink.c

@@ -1449,18 +1449,23 @@ done:
   gst_buffer_unref (buffer);
   return ret;
 
+  /* ERRORS */
 error:
+  {
     GST_ELEMENT_ERROR (sink, RESOURCE, WRITE,
         ("Internal error: could not render surface"), (NULL));
     ret = GST_FLOW_ERROR;
     goto done;
+  }
 
 no_surface:
+  {
     /* No surface or surface proxy. That's very bad! */
     GST_WARNING_OBJECT (sink, "could not get surface");
     ret = GST_FLOW_ERROR;
     goto done;
   }
+}
 
 static GstFlowReturn
 gst_vaapisink_show_frame (GstVideoSink * video_sink, GstBuffer * src_buffer)

gst/vaapi/gstvaapivideomemory.c

@@ -436,30 +436,46 @@ gst_vaapi_video_memory_map (GstVaapiVideoMemory * mem, gsize maxsize,
 
   /* ERRORS */
 error_unsupported_map:
+  {
     GST_ERROR ("unsupported map flags (0x%x)", flags);
     return NULL;
+  }
 error_unsupported_map_type:
+  {
     GST_ERROR ("unsupported map type (%d)", mem->map_type);
     return NULL;
+  }
 error_no_surface_proxy:
+  {
     GST_ERROR ("failed to extract GstVaapiSurfaceProxy from video meta");
     return NULL;
+  }
 error_no_surface:
+  {
     GST_ERROR ("failed to extract VA surface from video buffer");
     return NULL;
+  }
 error_no_current_surface:
+  {
     GST_ERROR ("failed to make surface current");
     return NULL;
+  }
 error_no_image:
+  {
     GST_ERROR ("failed to extract VA image from video buffer");
     return NULL;
+  }
 error_no_current_image:
+  {
     GST_ERROR ("failed to make image current");
     return NULL;
+  }
 error_map_image:
+  {
     GST_ERROR ("failed to map VA image");
     return NULL;
   }
+}
 
 static void
 gst_vaapi_video_memory_unmap (GstVaapiVideoMemory * mem)
@@ -482,9 +498,11 @@ gst_vaapi_video_memory_unmap (GstVaapiVideoMemory * mem)
 
   /* ERRORS */
 error_incompatible_map:
+  {
     GST_ERROR ("incompatible map type (%d)", mem->map_type);
     return;
   }
+}
 
 static GstVaapiVideoMemory *
 gst_vaapi_video_memory_copy (GstVaapiVideoMemory * mem,
@@ -518,15 +536,21 @@ gst_vaapi_video_memory_copy (GstVaapiVideoMemory * mem,
 
   /* ERRORS */
 error_no_current_surface:
+  {
     GST_ERROR ("failed to make surface current");
     return NULL;
+  }
 error_unsupported:
+  {
     GST_ERROR ("failed to copy partial memory (unsupported operation)");
     return NULL;
+  }
 error_allocate_memory:
+  {
     GST_ERROR ("failed to allocate GstVaapiVideoMemory copy");
     return NULL;
   }
+}
 
 static GstVaapiVideoMemory *
 gst_vaapi_video_memory_share (GstVaapiVideoMemory * mem,

gst/vaapi/gstvaapivideometa.c

@@ -307,10 +307,13 @@ gst_vaapi_video_meta_new_from_pool (GstVaapiVideoPool * pool)
   set_display (meta, gst_vaapi_video_pool_get_display (pool));
   return meta;
 
+  /* ERRORS */
 error:
+  {
     gst_vaapi_video_meta_unref (meta);
     return NULL;
   }
+}
 
 /**
  * gst_vaapi_video_meta_new_with_image:

gst/vaapi/gstvaapivideometa_texture.c

@@ -143,10 +143,13 @@ meta_texture_new (void)
     goto error;
   return meta;
 
+  /* ERRORS */
 error:
+  {
     meta_texture_free (meta);
     return NULL;
   }
+}
 
 static GstVaapiVideoMetaTexture *
 meta_texture_copy (GstVaapiVideoMetaTexture * meta)
@@ -237,10 +240,13 @@ gst_buffer_add_texture_upload_meta (GstBuffer * buffer)
     goto error;
   return TRUE;
 
+  /* ERRORS */
 error:
+  {
     meta_texture_free (meta_texture);
     return FALSE;
   }
+}
 
 gboolean
 gst_buffer_ensure_texture_upload_meta (GstBuffer * buffer)