xprtrdma: Refactor rpcrdma_buffer_create() and rpcrdma_buffer_destroy()
xprtrdma: Refactor rpcrdma_buffer_create() and rpcrdma_buffer_destroy()

Move the details of how to create and destroy rpcrdma_req and
rpcrdma_rep structures into helper functions.

Signed-off-by: Chuck Lever <e7d8216bf9b1956703857d0050bd04192118f43d@oracle.com>
Reviewed-by: Steve Wise <6f43c86433b33e5fe92b209bedebd0f6dba5b49c@opengridcomputing.com>
Signed-off-by: Anna Schumaker <5381043123508d4eed62c465c7c46f2f193a2767@Netapp.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs