PCI/ERR: Cleanup misleading indentation inside if conditions

A few if conditions align misleadingly with the following code block.  The
checks are really cascading NULL checks that fit into 80 chars so remove
newlines in between and realign to the if condition indent.

Link: https://lore.kernel.org/r/20240429094707.2529-1-ilpo.jarvinen@linux.intel.com


Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>