rtlwifi: btcoexist: avoid format string in printk

Since CL_PRINTF only ever takes a single argument, make sure a format
string cannot leak into printk.
Signed-off-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/btcoexist/halbtcoutsrc.h

@@ -114,7 +114,7 @@ extern u32 btc_dbg_type[];
 
 
 #define	CL_SPRINTF	snprintf
-#define	CL_PRINTF	printk
+#define	CL_PRINTF(buf)	printk("%s", buf)
 
 #define	BTC_PRINT(dbgtype, dbgflag, printstr, ...)		\
 	do {							\