staging: rtl8187se: Added parenthesis in a macro in r8180.h

This patch adds parentheses to enclose a complex value in a macro as a the
CodingStyle recommends.

This errors was found by checkpatch.pl script
Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8187se/r8180.h

@@ -47,7 +47,7 @@
 #define EPROM_93c46 0
 #define EPROM_93c56 1
 
-#define RTL_IOCTL_WPA_SUPPLICANT		SIOCIWFIRSTPRIV+30
+#define RTL_IOCTL_WPA_SUPPLICANT (SIOCIWFIRSTPRIV + 30)
 
 #define DEFAULT_FRAG_THRESHOLD 2342U
 #define MIN_FRAG_THRESHOLD 256U