[NUT-devel] [MPlayer-dev-eng] [PATCH] nut.txt: clarify description of reserved_count in frame header

The pseudocode for the coded reserved_count in a frame header says "reserved_count[frame_code]". This could be interpreted as meaning that the coded value resets the value for this frame_code, i.e., that the coded value would also be the default value for all further occurrences of this frame code. The patch introduces a temporary variable to avoid that interpretation.