USB: usb/storage/initializers.c: fix signedness difference

fix warnings:
drivers/usb/storage/initializers.c:83:26: warning: incorrect type in argument 5 (different signedness)
drivers/usb/storage/initializers.c:83:26:    expected unsigned int *act_len
drivers/usb/storage/initializers.c:83:26:    got int *<noident>
drivers/usb/storage/initializers.c:89:26: warning: incorrect type in argument 5 (different signedness)
drivers/usb/storage/initializers.c:89:26:    expected unsigned int *act_len
drivers/usb/storage/initializers.c:89:26:    got int *<noident>

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/storage/initializers.c b/drivers/usb/storage/initializers.c
index ee5b42a..187dd1e 100644
--- a/drivers/usb/storage/initializers.c
+++ b/drivers/usb/storage/initializers.c
@@ -66,7 +66,8 @@
 {
 	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf;
 	struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf;
-	int res, partial;
+	int res;
+	unsigned int partial;
 	static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS";
 
 	US_DEBUGP("Sending UCR-61S2B initialization packet...\n");