tty: xuartps: Fix "may be used uninitialized" build warning

Initialize varibles for which a 'may be used uninitalized' warning is
issued.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/xilinx_uartps.c

@@ -389,7 +389,7 @@ static unsigned int xuartps_set_baud_rate(struct uart_port *port,
 		unsigned int baud)
 {
 	unsigned int calc_baud;
-	u32 cd, bdiv;
+	u32 cd = 0, bdiv = 0;
 	u32 mreg;
 	int div8;
 	struct xuartps *xuartps = port->private_data;