Issue a warning when fed with misformatted one-line doxygen comments.

Originally committed as revision 24660 to svn://svn.ffmpeg.org/ffmpeg/trunk

tools/patcheck

@@ -52,6 +52,7 @@ hiegrep '(static|inline|const) *\1'  'duplicate word' $*
 hiegrep 'INIT_VLC_USE_STATIC' 'forbidden ancient vlc type' $*
 hiegrep '=[-+\*\&] ' 'looks like compound assignment' $*
 hiegrep2 '/\*\* *[a-zA-Z0-9].*' '\*/' 'Inconsistently formatted doxygen comment' $*
+hiegrep '; */\*\*[^<]' 'Misformatted doxygen comment' $*
 
 hiegrep2 '(int|unsigned|static|void)[a-zA-Z0-9 _]*(init|end)[a-zA-Z0-9 _]*\(.*[^;]$' '(av_cold|:\+[^a-zA-Z_])' 'These functions may need av_cold, please review the whole patch for similar functions needing av_cold' $*