PCI: altera: Clean up indentation issue on a return statement

A return statment is indented incorrectly, remove extraneous space.

Link: https://lore.kernel.org/r/20200327134556.265411-1-colin.king@canonical.com


Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>