[PATCH] usb: gadget: u_serial: fix coverity warning: negative index at array

[Macpaul Lin]

This issue has been reported by coverity scanner.
Replace "int portnum" by "unsigned int", this void negative index at
array.

Signed-off-by: Stan Lu <stan...@mediatek.com>
Signed-off-by: Macpaul Lin <macpaul....@mediatek.com>
---
 drivers/usb/gadget/function/u_serial.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/u_serial.c 
b/drivers/usb/gadget/function/u_serial.c
index 8167d37..53951f2 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -587,7 +587,7 @@ static int gs_start_io(struct gs_port *port)
  */
 static int gs_open(struct tty_struct *tty, struct file *file)
 {
-       int             port_num = tty->index;
+       unsigned int    port_num = tty->index;
        struct gs_port  *port;
        int             status = 0;
 
@@ -1211,7 +1211,7 @@ int gserial_alloc_line_no_console(unsigned char *line_num)
        struct gs_port                  *port;
        struct device                   *tty_dev;
        int                             ret;
-       int                             port_num;
+       unsigned int                    port_num;
 
        coding.dwDTERate = cpu_to_le32(9600);
        coding.bCharFormat = 8;
-- 
1.7.9.5