cache: remove unused variable in cache_open

Signed-off-by: Jean First <jeanfirst@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/cache.c

@@ -51,7 +51,6 @@ typedef struct Context {
 
 static int cache_open(URLContext *h, const char *arg, int flags)
 {
-    int access;
     const char *buffername;
     Context *c= h->priv_data;