Brian Behlendorf 0365064a97 Handle closing an unopened ZVOL
Thank to commit a4430fce69 we're
now correctly returning EROFS when opening a zvol on a read-only
pool.  Unfortunately, it looks like this causes us to trigger
some unexpected behavior by __blkdev_get().

In the failure case it's possible __blkdev_get() will call
__blkdev_put() for a bdev which was never successfully opened.
This results in us trying to close the device again and hitting
the NULL dereference.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1343
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Native ZFS for Linux!

ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org

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