[PATCH] usb: host: ehci-q: make qtd_fill() return 'u16'

[Sergey Shtylyov <s.shtylyov@omp.ru>]

At the end of qtd_fill(), we assign the 'int count' variable to the 'size_t
length' field of 'struct ehci_qtd'.  In order not to mix the *signed* and
*unsigned* values let's make that variable and the function's result 'u16'
as qTD's maximum length is a 15-bit quantity anyway...

Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.

Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>

---
This patch is against the 'usb-next' branch of Greg KH's 'usb.git' repo.

 drivers/usb/host/ehci-q.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: usb/drivers/usb/host/ehci-q.c
===================================================================
--- usb.orig/drivers/usb/host/ehci-q.c
+++ usb/drivers/usb/host/ehci-q.c
@@ -33,12 +33,13 @@
 
 /* fill a qtd, returning how much of the buffer we were able to queue up */
 
-static int
+static u16
 qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf,
 		  size_t len, int token, int maxpacket)
 {
-	int	i, count;
 	u64	addr = buf;
+	u16	count;
+	int	i;
 
 	/* one buffer entry per 4K ... first might be short or unaligned */
 	qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr);