scsi: PCI: Convert to_pci_dev() into an inline function

Clang's context analysis checker performs alias analysis on expressions
passed to annotations like __acquires(). Clang's alias analysis does not
support container_of(). Convert to_pci_dev() from a macro into an inline
function such that Clang recognizes multiple to_pci_dev() expressions as
identical if the 'dev' argument is the same.

It is on purpose that to_pci_dev() accepts a const pointer and returns a
pointer that is not const. Any other choice, e.g. accepting a non-const
pointer or returning a const pointer, triggers compiler errors in code
that uses the to_pci_dev() macro.

While _Generic() could be used to support const and non-const struct
device pointers in a more elegant way, Clang's alias analysis does not
support _Generic().

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/f147ad227b85439d56183e60e0332547b84441bc.1790360262.git.bvanassche@acm.org
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

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