staging: comedi: me4000: remove serial_no from the private data

This value is read from the pci config space but it is never used.
Just remove it.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/me4000.c

@@ -338,11 +338,6 @@ static int init_board_info(struct comedi_device *dev, struct pci_dev *pci_dev_p)
 	/* spin_lock_init(&info->preload_lock); */
 	/* spin_lock_init(&info->ai_ctrl_lock); */
 
-	/* Get the serial number */
-	result = pci_read_config_dword(pci_dev_p, 0x2C, &info->serial_no);
-	if (result != PCIBIOS_SUCCESSFUL)
-		return result;
-
 	/* Get the hardware revision */
 	result = pci_read_config_byte(pci_dev_p, 0x08, &info->hw_revision);
 	if (result != PCIBIOS_SUCCESSFUL)

drivers/staging/comedi/drivers/me4000.h

@@ -252,7 +252,6 @@ struct me4000_info {
 	unsigned long timer_regbase;	/*  Base address of the timer circuit */
 	unsigned long program_regbase;	/*  Base address to set the program pin for the xilinx */
 
-	unsigned int serial_no;	/*  Serial number of the board */
 	unsigned char hw_revision;	/*  Hardware revision of the board */
 	unsigned short vendor_id;	/*  Meilhaus vendor id */
 	unsigned short device_id;	/*  Device id */