printk: simplify no_printk()

Commit 069f0cd ("printk: Make the printk*once() variants return
a value") surrounded the macro implementation with ({ ... }).

Now, the inner do { ... } while (0); is redundant.

Link: http://lkml.kernel.org/r/[email protected]
Cc: Andrew Morton <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: [email protected]
Signed-off-by: Masahiro Yamada <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>

Author: masahir0y

include/linux/printk.h

@@ -131,10 +131,8 @@ struct va_format {
  */
 #define no_printk(fmt, ...)				\
 ({							\
-	do {						\
-		if (0)					\
-			printk(fmt, ##__VA_ARGS__);	\
-	} while (0);					\
+	if (0)						\
+		printk(fmt, ##__VA_ARGS__);		\
 	0;						\
 })