configure: fix cosmetic typo in check_mathfunc

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21748 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -669,7 +669,7 @@ EOF
 }
 
 check_mathfunc(){
-    log check_func "$@"
+    log check_mathfunc "$@"
     func=$1
     shift
     disable $func