staging: rtl8712: spaces preferred around operands

Clean up all instances of checkpatch.pl checks:
CHECK: spaces preferred around that '+'
(and other operands)

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rtl8712/mlme_linux.c b/drivers/staging/rtl8712/mlme_linux.c
index 6d253bf..e4e4bde 100644
--- a/drivers/staging/rtl8712/mlme_linux.c
+++ b/drivers/staging/rtl8712/mlme_linux.c
@@ -163,7 +163,7 @@
 			p += sprintf(p, "%02x", sec_ie[i]);
 		p += sprintf(p, ")");
 		memset(&wrqu, 0, sizeof(wrqu));
-		wrqu.data.length = p-buff;
+		wrqu.data.length = p - buff;
 		wrqu.data.length = (wrqu.data.length < IW_CUSTOM_MAX) ?
 				   wrqu.data.length : IW_CUSTOM_MAX;
 		wireless_send_event(adapter->pnetdev, IWEVCUSTOM, &wrqu, buff);