pci_iounmap(): Fix MMIO mapping leak

The #ifdef ARCH_HAS_GENERIC_IOPORT_MAP accidentally also guards iounmap(),
which means MMIO mappings are leaked.

Move the guard so we call iounmap() for MMIO mappings.

Fixes: 316e8d7 ("pci_iounmap'2: Electric Boogaloo: try to make sense of it all")
Link: https://lore.kernel.org/r/[email protected]
Reported-by: Danilo Krummrich <[email protected]>
Suggested-by: Arnd Bergmann <[email protected]>
Signed-off-by: Philipp Stanner <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Cc: <[email protected]> # v5.15+

Author: Philipp Stanner

lib/pci_iomap.c

@@ -170,8 +170,8 @@ void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 
 	if (addr >= start && addr < start + IO_SPACE_LIMIT)
 		return;
-	iounmap(p);
 #endif
+	iounmap(p);
 }
 EXPORT_SYMBOL(pci_iounmap);