i40e: refactor DCB function

BugLink: http://bugs.launchpad.net/bugs/1547674

This is a simple refactor suggested by the community
to change a multi-level if statement into a switch.

Change-ID: I831cf3c40426022220aa9b43990022d22dfd50db
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from net-next commit dd54a1ad)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/net/ethernet/intel/i40e/i40e_dcb.c

@@ -380,17 +380,20 @@ static void i40e_parse_cee_app_tlv(struct i40e_cee_feat_tlv *tlv,
 {
 	u16 length, typelength, offset = 0;
 	struct i40e_cee_app_prio *app;
-	u8 i, up, selector;
+	u8 i;
 
 	typelength = ntohs(tlv->hdr.typelen);
 	length = (u16)((typelength & I40E_LLDP_TLV_LEN_MASK) >>
 		       I40E_LLDP_TLV_LEN_SHIFT);
 
 	dcbcfg->numapps = length / sizeof(*app);
+
 	if (!dcbcfg->numapps)
 		return;
 
 	for (i = 0; i < dcbcfg->numapps; i++) {
+		u8 up, selector;
+
 		app = (struct i40e_cee_app_prio *)(tlv->tlvinfo + offset);
 		for (up = 0; up < I40E_MAX_USER_PRIORITY; up++) {
 			if (app->prio_map & BIT(up))
@@ -400,13 +403,17 @@ static void i40e_parse_cee_app_tlv(struct i40e_cee_feat_tlv *tlv,
 
 		/* Get Selector from lower 2 bits, and convert to IEEE */
 		selector = (app->upper_oui_sel & I40E_CEE_APP_SELECTOR_MASK);
-		if (selector == I40E_CEE_APP_SEL_ETHTYPE)
+		switch (selector) {
+		case I40E_CEE_APP_SEL_ETHTYPE:
 			dcbcfg->app[i].selector = I40E_APP_SEL_ETHTYPE;
-		else if (selector == I40E_CEE_APP_SEL_TCPIP)
+			break;
+		case I40E_CEE_APP_SEL_TCPIP:
 			dcbcfg->app[i].selector = I40E_APP_SEL_TCPIP;
-		else
+			break;
+		default:
 			/* Keep selector as it is for unknown types */
 			dcbcfg->app[i].selector = selector;
+		}
 
 		dcbcfg->app[i].protocolid = ntohs(app->protocol);
 		/* Move to next app */