staging: axis-fifo: Remove parentheses in axis-fifo.c

staging: axis-fifo: remove parentheses in axis-fifo.c

Remove parentheses from the end of line and conform to
the coding style guidelines. Reported by checkpatch.

Add an extra space to the function arguments to fix
indentation.

Signed-off-by: Ioannis Valasakis <code@wizofe.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>