staging: rtl8192u: r819xU_firmware.h: fix line over 80 characters

Fixed coding style issue line "over 80 characters" detected by
checkpatch.pl in r819xU_firmware.h
Signed-off-by: Buţiu Alexandru Octavian <predator5047@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r819xU_firmware.h

@@ -2,7 +2,8 @@
 #define __INC_FIRMWARE_H
 
 #define RTL8190_CPU_START_OFFSET	0x80
-#define GET_COMMAND_PACKET_FRAG_THRESHOLD(v)	(4*(v/4) - 8 - USB_HWDESC_HEADER_LEN)
+#define GET_COMMAND_PACKET_FRAG_THRESHOLD(v) \
+	(4*(v/4) - 8 - USB_HWDESC_HEADER_LEN)
 
 typedef enum _firmware_init_step {
 	FW_INIT_STEP0_BOOT = 0,