staging: greybus: uart.c: change 'unsigned' to 'unsigned int'

Fixes checkpatch.pl warning:
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index 01aeed1..a3c753b 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -350,7 +350,7 @@
 				 &request, sizeof(request), NULL, 0);
 }
 
-static struct gb_tty *get_gb_by_minor(unsigned minor)
+static struct gb_tty *get_gb_by_minor(unsigned int minor)
 {
 	struct gb_tty *gb_tty;