SynEditTextBuffer: initialize out variable. issue #41553

(cherry picked from commit d8e4b249c3)

Co-authored-by: zeljan1 <zeljko@holobit.hr>

components/synedit/synedittextbuffer.pp

@@ -1147,6 +1147,7 @@ end;
 
 function TSynEditStringList.GetPChar(ALineIndex: Integer; out ALen: Integer): PChar;
 begin
+  ALen := 0;
   if (ALineIndex = 0) and (Count = 0) then  // simulate empty line
     Result := nil
   else