decklink: Remove unused variables to fix warning

Remove two unused variables that are causing a compiler warning on gcc.
The size was probably added in the past to calculate the the packet
size, but in the end was not actually needed.

plugins/decklink/audio-repack.c

@@ -25,7 +25,7 @@ int check_buffer(struct audio_repack *repack,
 	squash data array
 
 	| FL | FR |LFE | FC | BL | BR |emp |emp |
-    |    |       x      |    |
+	  |    |       x      |    |
 	| FL | FR | FC |LFE | BL | BR |
  */
 int repack_8to6ch_swap23(struct audio_repack *repack,
@@ -34,8 +34,6 @@ int repack_8to6ch_swap23(struct audio_repack *repack,
 	if (check_buffer(repack, frame_count) < 0)
 		return -1;
 
-	const uint32_t size = frame_count * repack->base_src_size;
-
 	const __m128i *src = (__m128i *)bsrc;
 	const __m128i *esrc = src + frame_count;
 	uint32_t *dst = (uint32_t *)repack->packet_buffer;
@@ -62,8 +60,6 @@ int repack_8ch_swap23(struct audio_repack *repack,
 	if (check_buffer(repack, frame_count) < 0)
 		return -1;
 
-	const uint32_t size = frame_count * repack->base_src_size;
-
 	const __m128i *src = (__m128i *)bsrc;
 	const __m128i *esrc = src + frame_count;
 	__m128i *dst = (__m128i *)repack->packet_buffer;