busybox: fix mount issue

busybox: fix mount issue

When the mount command is not given the filesystem type to mount, then
it will try all the known filesystems. However, when a filesystem is not
supported by the kernel, the mount function call will return ENODEV.

The following patch, ecd90bc6aa63da2aef2513ac090d4b426b2b719c,
introduced a problem because it bailed out on ENODEV too. Instead it should
have only bailed out on ENOMEDIUM.

[YOCTO #4308]

(From OE-Core rev: 82320d2074572477f26887eddc51dc2a1dfea403)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>