Remove incorrect use of ctype.h functions.

As far as I can tell the code should not change behaviour
depending on locale in any of these places.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

libavformat/hls.c

@@ -110,7 +110,7 @@ typedef struct HLSContext {
 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
 {
     int len = ff_get_line(s, buf, maxlen);
-    while (len > 0 && isspace(buf[len - 1]))
+    while (len > 0 && av_isspace(buf[len - 1]))
         buf[--len] = '\0';
     return len;
 }