iwm(4): gc struct iwm_rbuf and the wantresp field in struct iwm_rx_data.

[Imre Vadasz]

Hi,

The struct iwm_rbuf definition, and the wantresp field in struct
iwm_rx_data aren't used anywhere and can be removed:

Index: sys/dev/pci/if_iwmvar.h
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_iwmvar.h,v
retrieving revision 1.19
diff -u -r1.19 if_iwmvar.h
--- sys/dev/pci/if_iwmvar.h     15 Aug 2016 12:59:53 -0000      1.19
+++ sys/dev/pci/if_iwmvar.h     31 Aug 2016 18:53:25 -0000
@@ -264,17 +264,9 @@
 /* Linux driver optionally uses 8k buffer */
 #define IWM_RBUF_SIZE          4096
 
-struct iwm_softc;
-struct iwm_rbuf {
-       struct iwm_softc        *sc;
-       void                    *vaddr;
-       bus_addr_t              paddr;
-};
-
 struct iwm_rx_data {
        struct mbuf     *m;
        bus_dmamap_t    map;
-       int             wantresp;
 };
 
 struct iwm_rx_ring {