linux-user: fix openat

When running openat using qemu-arm, we stumbled over invalid permissions
on the created files. The reason for this is that the mode parameter gets
treates as an O_... flag, which it isn't - it's a permission bitmask.

This patch removes the needless translation of the mode parameter,
rendering permission passing of openat() to work with linux-user.
Reported-by: NDirk Mueller <dmueller@suse.de>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>

linux-user/syscall.c

@@ -379,25 +379,13 @@ static int sys_mknodat(int dirfd, const char *pathname, mode_t mode,
 }
 #endif
 #ifdef TARGET_NR_openat
-static int sys_openat(int dirfd, const char *pathname, int flags, ...)
+static int sys_openat(int dirfd, const char *pathname, int flags, mode_t mode)
 {
   /*
    * open(2) has extra parameter 'mode' when called with
    * flag O_CREAT.
    */
   if ((flags & O_CREAT) != 0) {
-      va_list ap;
-      mode_t mode;
-
-      /*
-       * Get the 'mode' parameter and translate it to
-       * host bits.
-       */
-      va_start(ap, flags);
-      mode = va_arg(ap, mode_t);
-      mode = target_to_host_bitmask(mode, fcntl_flags_tbl);
-      va_end(ap);
-
       return (openat(dirfd, pathname, flags, mode));
   }
   return (openat(dirfd, pathname, flags));