media: flexcop: avoid -Wempty-body warning

Building with 'make W=1' shows many warnings -Wempty-body warnings like

drivers/media/common/b2c2/flexcop-misc.c: In function 'flexcop_determine_revision':
drivers/media/common/b2c2/flexcop-misc.c:35:85: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
   35 |                 deb_info("this FlexCop has the 6 basic main hardware pid filter.\n");

drivers/media/usb/b2c2/flexcop-usb.c: In function 'flexcop_usb_process_frame':
drivers/media/usb/b2c2/flexcop-usb.c:357:79: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
  357 |                                         deb_ts("not ts packet %*ph\n", 4, b+2);
      |                                                                               ^
drivers/media/common/b2c2/flexcop-misc.c: In function 'flexcop_determine_revision':
drivers/media/common/b2c2/flexcop-misc.c:35:85: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
   35 |                 deb_info("this FlexCop has the 6 basic main hardware pid filter.\n");
      |                                                                                     ^

Change the empty dprintk() macros to no_printk(), which avoids this
warning and adds format string checking.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/common/b2c2/flexcop.h

@@ -14,10 +14,10 @@ extern int b2c2_flexcop_debug;
 
 /* debug */
 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
-#define dprintk(level,args...) \
-	do { if ((b2c2_flexcop_debug & level)) printk(args); } while (0)
+#define dprintk(level, args...) \
+	do { if ((b2c2_flexcop_debug & (level))) printk(args); } while (0)
 #else
-#define dprintk(level,args...)
+#define dprintk(level, args...) no_printk(args)
 #endif
 
 #define deb_info(args...) dprintk(0x01, args)

drivers/media/pci/b2c2/flexcop-pci.c

@@ -18,11 +18,11 @@ module_param(irq_chk_intv, int, 0644);
 MODULE_PARM_DESC(irq_chk_intv, "set the interval for IRQ streaming watchdog.");
 
 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
-#define dprintk(level,args...) \
-	do { if ((debug & level)) printk(args); } while (0)
+#define dprintk(level, args...) \
+	do { if ((debug & (level))) printk(args); } while (0)
 #define DEBSTATUS ""
 #else
-#define dprintk(level,args...)
+#define dprintk(level, args...) no_printk(args)
 #define DEBSTATUS " (debugging is not enabled)"
 #endif
 

drivers/media/usb/b2c2/flexcop-usb.c

@@ -15,8 +15,8 @@
 
 /* debug */
 #ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
-#define dprintk(level,args...) \
-	do { if ((debug & level)) printk(args); } while (0)
+#define dprintk(level, args...) \
+	do { if ((debug & (level))) printk(args); } while (0)
 
 #define debug_dump(b, l, method) do {\
 	int i; \
@@ -27,8 +27,8 @@
 
 #define DEBSTATUS ""
 #else
-#define dprintk(level, args...)
-#define debug_dump(b, l, method)
+#define dprintk(level, args...) no_printk(args)
+#define debug_dump(b, l, method) do { } while (0)
 #define DEBSTATUS " (debugging is not enabled)"
 #endif