staging: wlan-ng: replace WLAN_CTL_FRAMELEN with inline function in p80211hdr.h

checkpatch reports a "CHECK" diagnostic for WLAN_CTL_FRAMELEN as the
macro reuses its argument, leading to possible side-effects. Avoid
this by replacing the macro with an equivalent function, named
wlan_ctl_framelen (as recommended in the coding style). All references
to the macro also updated accordingly.
Signed-off-by: Tim Collier <osdevtc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/p80211hdr.h

@@ -174,15 +174,25 @@ union p80211_hdr {
 
 /* Frame and header length macros */
 
-#define WLAN_CTL_FRAMELEN(fstype) (\
-	(fstype) == WLAN_FSTYPE_BLOCKACKREQ	? 24 : \
-	(fstype) == WLAN_FSTYPE_BLOCKACK	? 152 : \
-	(fstype) == WLAN_FSTYPE_PSPOLL		? 20 : \
-	(fstype) == WLAN_FSTYPE_RTS		? 20 : \
-	(fstype) == WLAN_FSTYPE_CTS		? 14 : \
-	(fstype) == WLAN_FSTYPE_ACK		? 14 : \
-	(fstype) == WLAN_FSTYPE_CFEND		? 20 : \
-	(fstype) == WLAN_FSTYPE_CFENDCFACK	? 20 : 4)
+static inline u16 wlan_ctl_framelen(u16 fstype)
+{
+	switch (fstype)	{
+	case WLAN_FSTYPE_BLOCKACKREQ:
+		return 24;
+	case WLAN_FSTYPE_BLOCKACK:
+		return 152;
+	case WLAN_FSTYPE_PSPOLL:
+	case WLAN_FSTYPE_RTS:
+	case WLAN_FSTYPE_CFEND:
+	case WLAN_FSTYPE_CFENDCFACK:
+		return 20;
+	case WLAN_FSTYPE_CTS:
+	case WLAN_FSTYPE_ACK:
+		return 14;
+	default:
+		return 4;
+	}
+}
 
 #define WLAN_FCS_LEN			4
 
@@ -201,7 +211,7 @@ static inline u16 p80211_headerlen(u16 fctl)
 			hdrlen += ETH_ALEN;
 		break;
 	case WLAN_FTYPE_CTL:
-		hdrlen = WLAN_CTL_FRAMELEN(WLAN_GET_FC_FSTYPE(fctl)) -
+		hdrlen = wlan_ctl_framelen(WLAN_GET_FC_FSTYPE(fctl)) -
 		    WLAN_FCS_LEN;
 		break;
 	default: