Fix typo.

Originally committed as revision 23459 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/lavfi-regression.sh

@@ -68,7 +68,7 @@ vflip
 "
 
 if [ -n "$do_lavfi_pix_fmts" ]; then
-    # exclude pixel format currently not supported by NUT and which are not supported as input
+    # exclude pixel formats currently not supported by NUT and which are not supported as input
     excluded_pix_fmts="rgb4_byte bgr4_byte rgb444le rgb444be bgr444le bgr444be"
     excluded_pix_fmts="$excluded_pix_fmts $(ffmpeg -pix_fmts list 2>/dev/null | sed -ne '9,$p' | grep '^\..\.' | cut -d' ' -f2)"