UBUNTU: SAUCE: (noup) qla2xxx: Add irq affinity notification V2

BugLink: http://bugs.launchpad.net/bugs/1554003



Commit cdb898c5 introduced a regression by accessing a Null pointer.  This occured
 when checking older 4G adapters, that do not have MSIX support.  Add a check for rsp->msix.

Fixes: commit cdb898c5: ("qla2xxx: Add irq affinity notification")
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>