staging:rtl8192u: Remove unused union ECW -Style

The union ECW is never used in code so has simply been removed.
This is a coding style change which should have no impact on runtime
code execution.
Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/rtl819x_Qos.h

@@ -24,18 +24,6 @@ union aci_aifsn {
 	} f;	// Field
 };
 
-//
-// ECWmin/ECWmax field.
-// Ref: WMM spec 2.2.2: WME Parameter Element, p.13.
-//
-typedef	union _ECW {
-	u8	charData;
-	struct {
-		u8	ECWmin:4;
-		u8	ECWmax:4;
-	} f;	// Field
-} ECW, *PECW;
-
 //
 // Direction Field Values.
 // Ref: WMM spec 2.2.11: WME TSPEC Element, p.18.