trivial: wusb: Storage class should be before const qualifier

The C99 specification states in section 6.11.5:

The placement of a storage-class specifier other than at the beginning
of the declaration specifiers in a declaration is an obsolescent
feature.

Acked-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

include/linux/usb/wusb.h

@@ -80,8 +80,7 @@ struct wusb_ckhdid {
 	u8 data[16];
 } __attribute__((packed));
 
-const static
-struct wusb_ckhdid wusb_ckhdid_zero = { .data = { 0 } };
+static const struct wusb_ckhdid wusb_ckhdid_zero = { .data = { 0 } };
 
 #define WUSB_CKHDID_STRSIZE (3 * sizeof(struct wusb_ckhdid) + 1)