[Toybox] [PATCH] mount: avoid deferencing NULL.

[enh]

I don't know why I wasn't seeing this yesterday, but I can't _not_ see
it today:

  newfstatat(AT_FDCWD, "/dev/block/loop6", {st_mode=S_IFBLK|0600,
st_rdev=makedev(7, 48), ...}, 0) = 0
  openat(AT_FDCWD, "/sys/block/loop48/loop/backing_file", O_RDONLY) = -1
ENOENT (No such file or directory)
  --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} ---
---
 toys/lsb/mount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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