serial: omap: remove redundant assignment to variable tmout

Variable tmout is being assigned a value that is never read, it is
being re-assinged in the following for-loop statement. The assignment
is redundant and can be removed.

Cleans up clang scan warning:
drivers/tty/serial/omap-serial.c:1096:3: warning: Value stored to 'tmout'
is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20240411085537.306020-1-colin.i.king@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/omap-serial.c

@@ -1093,7 +1093,6 @@ static void __maybe_unused wait_for_xmitr(struct uart_omap_port *up)
 
 	/* Wait up to 1s for flow control if necessary */
 	if (up->port.flags & UPF_CONS_FLOW) {
-		tmout = 1000000;
 		for (tmout = 1000000; tmout; tmout--) {
 			unsigned int msr = serial_in(up, UART_MSR);