x86/PCI: Remove superfluous returns from void functions

x86/PCI: Remove superfluous returns from void functions

Remove unnecessary empty return statements at the end of void functions
in arch/x86/kernel/quirks.c.

Signed-off-by: Krzysztof Wilczynski <kw@linux.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Bjorn Helgaas <helgaas@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-pci@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190820065121.16594-1-kw@linux.com