[PATCH 3/9] input: fix empty-body warning in synaptics.c

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Fix gcc empty-body warning when -Wextra is used:

../drivers/input/mouse/synaptics.c: In function ‘synaptics_process_packet’:
../drivers/input/mouse/synaptics.c:1106:6: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
      ;   /* Nothing, treat a pen as a single finger */
      ^

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/input/mouse/synaptics.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-next-20200327.orig/drivers/input/mouse/synaptics.c
+++ linux-next-20200327/drivers/input/mouse/synaptics.c
@@ -20,6 +20,7 @@
  * Trademarks are the property of their respective owners.
  */
 
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/dmi.h>
@@ -1103,7 +1104,7 @@ static void synaptics_process_packet(str
 				break;
 			case 2:
 				if (SYN_MODEL_PEN(info->model_id))
-					;   /* Nothing, treat a pen as a single finger */
+					do_empty(); /* Nothing, treat a pen as a single finger */
 				break;
 			case 4 ... 15:
 				if (SYN_CAP_PALMDETECT(info->capabilities))



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