cosmetics: typo fixes, usefuLL --> useful and aswell --> as well

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@22307 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale_internal.h

@@ -74,7 +74,7 @@ typedef struct SwsContext{
 	int16_t *vChrFilter;
 	int16_t *vChrFilterPos;
 
-	uint8_t formatConvBuffer[4000]; //FIXME dynamic alloc, but we have to change alot of code for this to be usefull
+	uint8_t formatConvBuffer[4000]; //FIXME dynamic alloc, but we have to change a lot of code for this to be useful
 
 	int hLumFilterSize;
 	int hChrFilterSize;