NTB: Fix Sparse Warnings

Address the sparse warnings and resulting fallout

Signed-off-by: Jon Mason <jon.mason@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/ntb/ntb_hw.c
Simple merge

diff --cc drivers/ntb/ntb_hw.h
Simple merge

diff --cc drivers/ntb/ntb_transport.c
Simple merge