mwifiex: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1].

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-throughSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200821064720.GA22182@embeddedor

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -1163,7 +1163,7 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 		case NL80211_IFTYPE_UNSPECIFIED:
 			mwifiex_dbg(priv->adapter, INFO,
 				    "%s: kept type as IBSS\n", dev->name);
-			/* fall through */
+			fallthrough;
 		case NL80211_IFTYPE_ADHOC:	/* This shouldn't happen */
 			return 0;
 		default:
@@ -1194,7 +1194,7 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 		case NL80211_IFTYPE_UNSPECIFIED:
 			mwifiex_dbg(priv->adapter, INFO,
 				    "%s: kept type as STA\n", dev->name);
-			/* fall through */
+			fallthrough;
 		case NL80211_IFTYPE_STATION:	/* This shouldn't happen */
 			return 0;
 		default:
@@ -1217,7 +1217,7 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 		case NL80211_IFTYPE_UNSPECIFIED:
 			mwifiex_dbg(priv->adapter, INFO,
 				    "%s: kept type as AP\n", dev->name);
-			/* fall through */
+			fallthrough;
 		case NL80211_IFTYPE_AP:		/* This shouldn't happen */
 			return 0;
 		default:
@@ -1257,7 +1257,7 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 		case NL80211_IFTYPE_UNSPECIFIED:
 			mwifiex_dbg(priv->adapter, INFO,
 				    "%s: kept type as P2P\n", dev->name);
-			/* fall through */
+			fallthrough;
 		case NL80211_IFTYPE_P2P_CLIENT:
 		case NL80211_IFTYPE_P2P_GO:
 			return 0;

drivers/net/wireless/marvell/mwifiex/ie.c

@@ -374,7 +374,7 @@ static int mwifiex_uap_parse_tail_ies(struct mwifiex_private *priv,
 						    (const u8 *)hdr,
 						    token_len))
 				break;
-			/* fall through */
+			fallthrough;
 		default:
 			if (ie_len + token_len > IEEE_MAX_IE_SIZE) {
 				err = -EINVAL;

drivers/net/wireless/marvell/mwifiex/scan.c

@@ -1328,7 +1328,7 @@ int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
 
 		case WLAN_EID_CHANNEL_SWITCH:
 			bss_entry->chan_sw_ie_present = true;
-			/* fall through */
+			fallthrough;
 		case WLAN_EID_PWR_CAPABILITY:
 		case WLAN_EID_TPC_REPORT:
 		case WLAN_EID_QUIET: