cosmetics: Align codec declarations

Also break some long lines, remove codec function placeholder comments
and add spaces in sample/pixel format lists.

Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/loco.c

@@ -294,5 +294,5 @@ AVCodec ff_loco_decoder = {
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,
-    .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
+    .long_name      = NULL_IF_CONFIG_SMALL("LOCO"),
 };