vbucket: Allocate for extra NUL
vbucket: Allocate for extra NUL

Change-Id: I06f686fa09aa6313f0cea6c72ec7673ac89d57c5
Reviewed-on: http://review.couchbase.org/31427
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

couchbase/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,uvenum/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,PureSwift/libcouchbase,avsej/libcouchbase,maxim-ky/libcouchbase,signmotion/libcouchbase,signmotion/libcouchbase,mody/libcouchbase,uvenum/libcouchbase,PureSwift/libcouchbase,senthilkumaranb/libcouchbase,mnunberg/libcouchbase,mnunberg/libcouchbase,avsej/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,PureSwift/libcouchbase,maxim-ky/libcouchbase,avsej/libcouchbase,maxim-ky/libcouchbase,mnunberg/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,senthilkumaranb/libcouchbase,uvenum/libcouchbase,senthilkumaranb/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,uvenum/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,PureSwift/libcouchbase,senthilkumaranb/libcouchbase,uvenum/libcouchbase,kojiromike/libcouchbase,mnunberg/libcouchbase,kojiromike/libcouchbase,mnunberg/libcouchbase