[PATCH v2] fusion: fix if-statement empty body warning

[Randy Dunlap <rdunlap@xxxxxxxxxxxxx>]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

When driver debugging is not enabled, change the debug print macros
to use the no_printk() macro.

This fixes a gcc warning when -Wextra is set:
../drivers/message/fusion/mptlan.c:266:39: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]

I have verified that there is very little object code change (with
gcc 7.5.0). There are a few changes like:
  cmp %a,%b
  jl $1
to
  cmp %b,%a
  jg $1

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Sathya Prakash <sathya.prakash@xxxxxxxxxxxx>
Cc: Chaitra P B <chaitra.basappa@xxxxxxxxxxxx>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@xxxxxxxxxxxx>
Cc: MPT-FusionLinux.pdl@xxxxxxxxxxxx
Cc: linux-scsi@xxxxxxxxxxxxxxx
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxx>
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Reviewed-by: Bart van Assche <bvanassche@xxxxxxx>
---
v2: use no_printk() macro instead of an empty do-while loop (Bart)

 drivers/message/fusion/mptlan.h |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- linux-next-20200306.orig/drivers/message/fusion/mptlan.h
+++ linux-next-20200306/drivers/message/fusion/mptlan.h
@@ -64,6 +64,7 @@
 #include <linux/if_arp.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
@@ -111,13 +112,13 @@ MODULE_DESCRIPTION(LANAME);
 #ifdef MPT_LAN_IO_DEBUG
 #define dioprintk(x)  printk x
 #else
-#define dioprintk(x)
+#define dioprintk(x)  no_printk x
 #endif
 
 #ifdef MPT_LAN_DEBUG
 #define dlprintk(x)  printk x
 #else
-#define dlprintk(x)
+#define dlprintk(x)  no_printk x
 #endif
 
 #define NETDEV_TO_LANPRIV_PTR(d)	((struct mpt_lan_priv *)netdev_priv(d))