timer: fix misspelling of "decicycles"

Signed-off-by: Mans Rullgard <mans@mansr.com>

libavutil/timer.h

@@ -61,7 +61,7 @@ tend= AV_READ_TIME();\
     }else\
         tskip_count++;\
     if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
-        av_log(NULL, AV_LOG_ERROR, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
+        av_log(NULL, AV_LOG_ERROR, "%"PRIu64" decicycles in %s, %d runs, %d skips\n",\
                tsum*10/tcount, id, tcount, tskip_count);\
     }\
 }