PCI/AER: Change pci_aer_init() stub to return void

Commit 60ed982a ("PCI/AER: Move internal declarations to
drivers/pci/pci.h") changed pci_aer_init() to return "void", but didn't
change the stub for when CONFIG_PCIEAER isn't enabled.  Change the stub to
match.

Fixes: 60ed982a ("PCI/AER: Move internal declarations to drivers/pci/pci.h")
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v4.19+

drivers/pci/pci.h

@@ -596,7 +596,7 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev);
 void pci_aer_clear_device_status(struct pci_dev *dev);
 #else
 static inline void pci_no_aer(void) { }
-static inline int pci_aer_init(struct pci_dev *d) { return -ENODEV; }
+static inline void pci_aer_init(struct pci_dev *d) { }
 static inline void pci_aer_exit(struct pci_dev *d) { }
 static inline void pci_aer_clear_fatal_status(struct pci_dev *dev) { }
 static inline void pci_aer_clear_device_status(struct pci_dev *dev) { }