gstreamer: Convert to pragma once

Remove the verbose #ifndef/#define/#endif pattern for maintaining
header idempotency, and replace it with a simple #pragma once.

This simplifies the headers, and prevents redundant changes when
header files get moved.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>

src/gstreamer/gstlibcamera-utils.h

@@ -6,8 +6,7 @@
  * gstlibcamera-utils.h - GStreamer libcamera Utility Functions
  */
 
-#ifndef __GST_LIBCAMERA_UTILS_H__
-#define __GST_LIBCAMERA_UTILS_H__
+#pragma once
 
 #include <libcamera/camera_manager.h>
 #include <libcamera/stream.h>
@@ -71,5 +70,3 @@ public:
 private:
 	GRecMutex *mutex_;
 };
-
-#endif /* __GST_LIBCAMERA_UTILS_H__ */

src/gstreamer/gstlibcameraallocator.h

@@ -6,8 +6,7 @@
  * gstlibcameraallocator.h - GStreamer Custom Allocator
  */
 
-#ifndef __GST_LIBCAMERA_ALLOCATOR_H__
-#define __GST_LIBCAMERA_ALLOCATOR_H__
+#pragma once
 
 #include <gst/gst.h>
 #include <gst/allocators/allocators.h>
@@ -30,5 +29,3 @@ gsize gst_libcamera_allocator_get_pool_size(GstLibcameraAllocator *allocator,
 					    libcamera::Stream *stream);
 
 libcamera::FrameBuffer *gst_libcamera_memory_get_frame_buffer(GstMemory *mem);
-
-#endif /* __GST_LIBCAMERA_ALLOCATOR_H__ */

src/gstreamer/gstlibcamerapad.h

@@ -6,8 +6,7 @@
  * gstlibcamerapad.h - GStreamer Capture Element
  */
 
-#ifndef __GST_LIBCAMERA_PAD_H__
-#define __GST_LIBCAMERA_PAD_H__
+#pragma once
 
 #include "gstlibcamerapool.h"
 
@@ -33,5 +32,3 @@ GstFlowReturn gst_libcamera_pad_push_pending(GstPad *pad);
 bool gst_libcamera_pad_has_pending(GstPad *pad);
 
 void gst_libcamera_pad_set_latency(GstPad *pad, GstClockTime latency);
-
-#endif /* __GST_LIBCAMERA_PAD_H__ */

src/gstreamer/gstlibcamerapool.h

@@ -9,8 +9,7 @@
  * only. This pool cannot be configured or activated.
  */
 
-#ifndef __GST_LIBCAMERA_POOL_H__
-#define __GST_LIBCAMERA_POOL_H__
+#pragma once
 
 #include "gstlibcameraallocator.h"
 
@@ -29,6 +28,3 @@ libcamera::Stream *gst_libcamera_pool_get_stream(GstLibcameraPool *self);
 libcamera::Stream *gst_libcamera_buffer_get_stream(GstBuffer *buffer);
 
 libcamera::FrameBuffer *gst_libcamera_buffer_get_frame_buffer(GstBuffer *buffer);
-
-
-#endif /* __GST_LIBCAMERA_POOL_H__ */

src/gstreamer/gstlibcameraprovider.h

@@ -6,8 +6,7 @@
  * gstlibcameraprovider.h - GStreamer Device Provider
  */
 
-#ifndef __GST_LIBCAMERA_PROVIDER_H__
-#define __GST_LIBCAMERA_PROVIDER_H__
+#pragma once
 
 #include <gst/gst.h>
 
@@ -18,6 +17,3 @@ G_DECLARE_FINAL_TYPE(GstLibcameraProvider, gst_libcamera_provider,
 		     GST_LIBCAMERA, PROVIDER, GstDeviceProvider)
 
 G_END_DECLS
-
-#endif /* __GST_LIBCAMERA_PROVIDER_H__ */
-

src/gstreamer/gstlibcamerasrc.h

@@ -6,8 +6,7 @@
  * gstlibcamerasrc.h - GStreamer Capture Element
  */
 
-#ifndef __GST_LIBCAMERA_SRC_H__
-#define __GST_LIBCAMERA_SRC_H__
+#pragma once
 
 #include <gst/gst.h>
 
@@ -18,5 +17,3 @@ G_DECLARE_FINAL_TYPE(GstLibcameraSrc, gst_libcamera_src,
 		     GST_LIBCAMERA, SRC, GstElement)
 
 G_END_DECLS
-
-#endif /* __GST_LIBCAMERA_SRC_H__ */