bnxt_en: Fix compile error regression when CONFIG_BNXT_SRIOV is not set

bp->sriov_cfg is not defined when CONFIG_BNXT_SRIOV is not set.  Fix
it by adding a helper function bnxt_sriov_cfg() to handle the logic
with or without the config option.

Fixes: 46d08f5 ("bnxt_en: extend RTNL to VF check in devlink driver_reinit")
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/1637090770-22835-1-git-send-email-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -2258,6 +2258,16 @@ static inline void bnxt_db_write(struct bnxt *bp, struct bnxt_db_info *db,
 	}
 }
 
+/* Must hold rtnl_lock */
+static inline bool bnxt_sriov_cfg(struct bnxt *bp)
+{
+#if defined(CONFIG_BNXT_SRIOV)
+	return BNXT_PF(bp) && (bp->pf.active_vfs || bp->sriov_cfg);
+#else
+	return false;
+#endif
+}
+
 extern const u16 bnxt_lhint_arr[];
 
 int bnxt_alloc_rx_data(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

@@ -442,7 +442,7 @@ static int bnxt_dl_reload_down(struct devlink *dl, bool netns_change,
 	switch (action) {
 	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT: {
 		rtnl_lock();
-		if (BNXT_PF(bp) && (bp->pf.active_vfs || bp->sriov_cfg)) {
+		if (bnxt_sriov_cfg(bp)) {
 			NL_SET_ERR_MSG_MOD(extack,
 					   "reload is unsupported while VFs are allocated or being configured");
 			rtnl_unlock();