Input: psmouse - make dummy touchkit_ps2_detect() static

The dummy touchkit_ps2_detect() for the CONFIG_MOUSE_PS2_TOUCHKIT=n case
shouldn't be a global function.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/touchkit_ps2.h

@@ -15,7 +15,8 @@
 #ifdef CONFIG_MOUSE_PS2_TOUCHKIT
 int touchkit_ps2_detect(struct psmouse *psmouse, int set_properties);
 #else
-inline int touchkit_ps2_detect(struct psmouse *psmouse, int set_properties)
+static inline int touchkit_ps2_detect(struct psmouse *psmouse,
+				      int set_properties)
 {
 	return -ENOSYS;
 }