Remove a superfluous call to atoi in ffmpeg.c:opt_verbose

Patch by Stefano Sabatini ( stefano sabatini-lala poste it )
[FFmpeg-devel] [PATCH] Cosmetics: remove a superfluos call to atoi in
ffmpeg.c:opt_verbose

Originally committed as revision 12136 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -2181,7 +2181,7 @@ static void opt_me_threshold(const char *arg)
 static void opt_verbose(const char *arg)
 {
     verbose = atoi(arg);
-    av_log_set_level(atoi(arg));
+    av_log_set_level(verbose);
 }
 
 static void opt_frame_rate(const char *arg)