staging: r8188eu: mark IsFrameTypeCtrl as bool

Mark IsFrameTypeCtrl as bool as it returns true/false.
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vihas Makwana <makvihas@gmail.com>
Link: https://lore.kernel.org/r/20220302204737.49056-16-makvihas@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/wifi.h

@@ -372,7 +372,7 @@ static inline unsigned char *get_hdr_bssid(unsigned char *pframe)
 	return sa;
 }
 
-static inline int IsFrameTypeCtrl(unsigned char *pframe)
+static inline bool IsFrameTypeCtrl(unsigned char *pframe)
 {
 	if (WIFI_CTRL_TYPE == GetFrameType(pframe))
 		return true;