[PATCH] serial_core: fix sizeof(pointer)

sizeof when applied to a pointer typed expression gives the
size of the pointer.

Generated by: scripts/coccinelle/misc/noderef.cocci

Signed-off-by: Fengguang Wu <redacted>
---

 cocci-output-38612-39d907-serial_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c

@@ -640,7 +640,7 @@ static void uart_get_info(struct tty_por
 {
 	struct uart_port *uport = state->uart_port;
 
-	memset(retinfo, 0, sizeof(retinfo));
+	memset(retinfo, 0, sizeof(*retinfo));
 
 	retinfo->type	    = uport->type;
 	retinfo->line	    = uport->line;