iwm(4): Use uint32_t instead of enum type in __packed struct iwm_sf_cfg_cmd.

[Imre Vadasz]

Hi,

Although this doesn't seem to cause any issue at the moment, using an
enum type in a __packed struct should be avoided:

Index: sys/dev/pci/if_iwmreg.h
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_iwmreg.h,v
retrieving revision 1.14
diff -u -r1.14 if_iwmreg.h
--- sys/dev/pci/if_iwmreg.h     20 Jul 2016 18:24:38 -0000      1.14
+++ sys/dev/pci/if_iwmreg.h     31 Aug 2016 18:53:25 -0000
@@ -3225,14 +3225,14 @@
 
 /**
  * Smart Fifo configuration command.
- * @state: smart fifo state, types listed in iwm_sf_sate.
+ * @state: smart fifo state, types listed in enum %iwm_sf_state.
  * @watermark: Minimum allowed availabe free space in RXF for transient state.
  * @long_delay_timeouts: aging and idle timer values for each scenario
  * in long delay state.
  * @full_on_timeouts: timer values for each scenario in full on state.
  */
 struct iwm_sf_cfg_cmd {
-       enum iwm_sf_state state;
+       uint32_t state;
        uint32_t watermark[IWM_SF_TRANSIENT_STATES_NUMBER];
        uint32_t 
long_delay_timeouts[IWM_SF_NUM_SCENARIO][IWM_SF_NUM_TIMEOUT_TYPES];
        uint32_t 
full_on_timeouts[IWM_SF_NUM_SCENARIO][IWM_SF_NUM_TIMEOUT_TYPES];