scsi: csiostor: Add missing description for csio_rnode_fwevt_handler()'s 'fwevt' param

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/csiostor/csio_rnode.c:869: warning: Function parameter or member 'fwevt' not described in 'csio_rnode_fwevt_handler'

Link: https://lore.kernel.org/r/20200723122446.1329773-25-lee.jones@linaro.orgSigned-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/csiostor/csio_rnode.c

@@ -862,7 +862,7 @@ csio_rnode_devloss_handler(struct csio_rnode *rn)
 /**
  * csio_rnode_fwevt_handler - Event handler for firmware rnode events.
  * @rn:		rnode
- *
+ * @fwevt:	firmware event to handle
  */
 void
 csio_rnode_fwevt_handler(struct csio_rnode *rn, uint8_t fwevt)