Input: return -ENOMEM in select drivers when memory allocation fails

Instead of using -1 let's start using proper error codes.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 4831120..04d9bf3 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -699,7 +699,7 @@
 
 	psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
 	if (!etd)
-		return -1;
+		return -ENOMEM;
 
 	etd->parity[0] = 1;
 	for (i = 1; i < 256; i++)