Simplify boolean expression

[pjljvandelaar]

Why not replace

audio_wavefiles/src/audio-wavefiles.adb

Lines 50 to 52 in 8e1162c

	function No_Errors
	(WF : in out Wavefile) return Boolean
	is (for all Error of WF.Errors => Error = False);

with

   function No_Errors (WF : in out Wavefile) return Boolean is
     (for all Error of WF.Errors => not Error);

Problem detected and solved by Rejuvenation-Ada crate