SYSLINK: ipc - fix in notify_dispatcher.

This patch fixes an issue found in notify_dispatcher.c where we
were not calling iounmap() on "mailbx_hw_config.mbox_linear_addr"
which we had obtained using ioremap() earlier in ntfy_disp_init().
Signed-off-by: Jayan John <x00jayan@ti.com>

drivers/dsp/syslink/notify_dispatcher/notify_dispatcher.c

@@ -152,6 +152,8 @@ int ntfy_disp_deinit(void)
 		mailbx_hw_config.mailboxes[i] = (-1);
 	}
 
+	if (mailbx_hw_config.mbox_linear_addr != NULL)
+		iounmap((unsigned int *) mailbx_hw_config.mbox_linear_addr);
 	mailbx_hw_config.mbox_modules = 0;
 	mailbx_hw_config.mbox_linear_addr = (unsigned long int) (-1);
 	return 0;