src/device/pci_rom.c: Remove double initialization

In procedure pci_rom_probe(), variable vendev is initialized twice.
Remove one initialization.

BUG=b:112253891
TEST=Build and boot grunt.

Change-Id: I8a71aa1aea2047ab2d98e09d1d6610de552b6cb4
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/27949
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/device/pci_rom.c

@@ -41,7 +41,7 @@ struct rom_header *pci_rom_probe(struct device *dev)
 	rom_header = cbfs_boot_map_optionrom(dev->vendor, dev->device);
 
 	u32 vendev = (dev->vendor << 16) | dev->device;
-	u32 mapped_vendev = vendev;
+	u32 mapped_vendev;
 
 	mapped_vendev = map_oprom_vendev(vendev);