Revert "mov: Double-check that alias path is not an absolute path"

This reverts commit 9286de0459.
The change broke support for legit absolute file paths.

Reported-by: Maksym Veremeyenko <verem@m1stereo.tv>.

libavformat/mov.c

@@ -2394,7 +2394,7 @@ static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,
 {
     /* try relative path, we do not try the absolute because it can leak information about our
        system to an attacker */
-    if (ref->nlvl_to > 0 && ref->nlvl_from > 0 && ref->path[0] != '/') {
+    if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
         char filename[1024];
         char *src_path;
         int i, l;