mountmgr: Balance volume references in add_volume().

[Ken Thomases]

Some code paths implicitly incremented the reference count, but others did
not.  All code paths decremented it.  Now, all increment and decrement it.
---
dlls/mountmgr.sys/device.c |    7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)

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