FPGA Manager changes for 5.4-rc1

Here is the first set of changes for the 5.4-rc1 merge window.

They're all more or less cleanup patches:

- Carlos' patch addresses a checkpatch warning
- My first patch changes the return type of a function to align it with
  the fact that nothing checks the return value and it uncoditionally
  returned 0 anyways
- My second patch somehow fell through the cracks before and cleans up
  the FPGA bridge bindings by consolidating them instead of repeating
  the same paragraph over and over again.

All of these patches have been in the last few linux-next releases
without issues.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
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