PCI/ERR: Remove duplicated include from err.c

Remove duplicated include.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pcie/err.c

@@ -12,7 +12,6 @@
 
 #include <linux/pci.h>
 #include <linux/module.h>
-#include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/aer.h>