[IBBUS] fix a BS that cause due to access to uninitialized field.

[IBBUS] fix a BS that cause due to access to uninitialized field.

Allocate of PD failed as a result the driver called to destroying PD function. This function access to field in object that was not initialized. Since the function don't use these variables in any way i removed the code from the function.

git-svn-id: svn://openib.tc.cornell.edu/gen1@3004 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86