[SERIAL] Remove dead code.

serial8250_get_irq_map is no longer used anywhere in the kernel (it
used to be used by the isapnp code but isn't anymore) so it's dead
code, below is a patch to remove this.

drivers/serial/8250.c

@@ -2170,20 +2170,6 @@ int __init early_serial_setup(struct uart_port *port)
 	return 0;
 }
 
-/*
- * This is for ISAPNP only.
- */
-void serial8250_get_irq_map(unsigned int *map)
-{
-	int i;
-
-	for (i = 0; i < UART_NR; i++) {
-		if (serial8250_ports[i].port.type != PORT_UNKNOWN &&
-		    serial8250_ports[i].port.irq < 16)
-			*map |= 1 << serial8250_ports[i].port.irq;
-	}
-}
-
 /**
  *	serial8250_suspend_port - suspend one serial port
  *	@line:  serial line number
@@ -2418,7 +2404,6 @@ static void __exit serial8250_exit(void)
 module_init(serial8250_init);
 module_exit(serial8250_exit);
 
-EXPORT_SYMBOL(serial8250_get_irq_map);
 EXPORT_SYMBOL(serial8250_suspend_port);
 EXPORT_SYMBOL(serial8250_resume_port);
 

drivers/serial/8250.h

@@ -19,7 +19,6 @@
 
 int serial8250_register_port(struct uart_port *);
 void serial8250_unregister_port(int line);
-void serial8250_get_irq_map(unsigned int *map);
 void serial8250_suspend_port(int line);
 void serial8250_resume_port(int line);
 

drivers/serial/au1x00_uart.c

@@ -1313,20 +1313,6 @@ void unregister_serial(int line)
 	uart_unregister_port(&serial8250_reg, line);
 }
 
-/*
- * This is for ISAPNP only.
- */
-void serial8250_get_irq_map(unsigned int *map)
-{
-	int i;
-
-	for (i = 0; i < UART_NR; i++) {
-		if (serial8250_ports[i].port.type != PORT_UNKNOWN &&
-		    serial8250_ports[i].port.irq < 16)
-			*map |= 1 << serial8250_ports[i].port.irq;
-	}
-}
-
 /**
  *	serial8250_suspend_port - suspend one serial port
  *	@line:  serial line number
@@ -1382,7 +1368,6 @@ module_exit(serial8250_exit);
 
 EXPORT_SYMBOL(register_serial);
 EXPORT_SYMBOL(unregister_serial);
-EXPORT_SYMBOL(serial8250_get_irq_map);
 EXPORT_SYMBOL(serial8250_suspend_port);
 EXPORT_SYMBOL(serial8250_resume_port);