f_rockusb: Use NULL instead of 0 for pointers

get_rkusb() mistakenly uses integers without cast.
Convert them to proper type.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/usb/gadget/f_rockusb.c b/drivers/usb/gadget/f_rockusb.c
index 9ae02ae..9dd10f9 100644 (file)
--- a/drivers/usb/gadget/f_rockusb.c
+++ b/drivers/usb/gadget/f_rockusb.c
@@ -110,7 +110,7 @@ struct f_rockusb *get_rkusb(void)
        if (!f_rkusb) {
                f_rkusb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_rkusb));
                if (!f_rkusb)
-                       return 0;
+                       return NULL;
 
                rockusb_func = f_rkusb;
                memset(f_rkusb, 0, sizeof(*f_rkusb));
@@ -120,7 +120,7 @@ struct f_rockusb *get_rkusb(void)
                f_rkusb->buf_head = memalign(CONFIG_SYS_CACHELINE_SIZE,
                                             RKUSB_BUF_SIZE);
                if (!f_rkusb->buf_head)
-                       return 0;
+                       return NULL;
 
                f_rkusb->buf = f_rkusb->buf_head;
                memset(f_rkusb->buf_head, 0, RKUSB_BUF_SIZE);