m68k: amiserial - Kill warn_unused_result warnings

warning: ignoring return value of 'request_irq', declared with attribute
warn_unused_result

and clean up the error path handling.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>

drivers/char/amiserial.c

@@ -1963,6 +1963,7 @@ static int __init rs_init(void)
 {
 	unsigned long flags;
 	struct serial_state * state;
+	int error;
 
 	if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
 		return -ENODEV;
@@ -1975,8 +1976,11 @@ static int __init rs_init(void)
 	 *  We request SERDAT and SERPER only, because the serial registers are
 	 *  too spreaded over the custom register space
 	 */
-	if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
-		return -EBUSY;
+	if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4,
+				"amiserial [Paula]")) {
+		error = -EBUSY;
+		goto fail_put_tty_driver;
+	}
 
 	IRQ_ports = NULL;
 
@@ -1997,8 +2001,9 @@ static int __init rs_init(void)
 	serial_driver->flags = TTY_DRIVER_REAL_RAW;
 	tty_set_operations(serial_driver, &serial_ops);
 
-	if (tty_register_driver(serial_driver))
-		panic("Couldn't register serial driver\n");
+	error = tty_register_driver(serial_driver);
+	if (error)
+		goto fail_release_mem_region;
 
 	state = rs_table;
 	state->magic = SSTATE_MAGIC;
@@ -2024,8 +2029,14 @@ static int __init rs_init(void)
 	local_irq_save(flags);
 
 	/* set ISRs, and then disable the rx interrupts */
-	request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
-	request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
+	error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
+	if (error)
+		goto fail_unregister;
+
+	error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
+			    "serial RX", state);
+	if (error)
+		goto fail_free_irq;
 
 	/* turn off Rx and Tx interrupts */
 	custom.intena = IF_RBF | IF_TBE;
@@ -2045,6 +2056,16 @@ static int __init rs_init(void)
 	ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
 
 	return 0;
+
+fail_free_irq:
+	free_irq(IRQ_AMIGA_TBE, state);
+fail_unregister:
+	tty_unregister_driver(serial_driver);
+fail_release_mem_region:
+	release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
+fail_put_tty_driver:
+	put_tty_driver(serial_driver);
+	return error;
 }
 
 static __exit void rs_exit(void) 
@@ -2064,6 +2085,9 @@ static __exit void rs_exit(void)
 	  kfree(info);
 	}
 
+	free_irq(IRQ_AMIGA_TBE, rs_table);
+	free_irq(IRQ_AMIGA_RBF, rs_table);
+
 	release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
 }