private-lib fixup

don't try to read /usr/bin/firejail if private-bin removed it
from the sandbox filesystem

src/firejail/fs_lib.c

@@ -195,6 +195,11 @@ void fslib_mount_libs(const char *full_path, unsigned user) {
  assert(full_path);
  // if library/executable does not exist or the user does not have read access to it
  // print a warning and exit the function.
+ if (access(full_path, F_OK)) {
+ if (arg_debug || arg_debug_private_lib)
+ printf("Cannot find %s, skipping...\n", full_path);
+ return;
+ }
  if (user && access(full_path, R_OK)) {
  if (arg_debug || arg_debug_private_lib)
  printf("Cannot read %s, skipping...\n", full_path);