winverbs: fix cleanup in error handling cases

winverbs: fix cleanup in error handling cases

Running the ndmw test results in a crash in the winverbs driver.  The
crash is caused by improper cleanup in the winverbs driver as a result
of a failure trying to allocate a memory window.

In studying the crash, the same situation could arise if other objects
also fail to be created (QPs, CQs, PDs, etc.)  To fix the crash and
simplify the code, explicit calls to used to increment the reference
count on referenced objects, rather than simply holding onto the
reference that was acquired when the object was validated.  (The latter
is slightly more efficient, but results in less maintainable code
once any fix is applied.)

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
git-svn-id: svn://openib.tc.cornell.edu/gen1/trunk@2320 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86