staging: greybus: loopback_test: Remove extra blank lines

Clean up extra uses of blank lines that do not follow the kernel coding
style. Issue reported by checkpatch.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jack Schofield <schofija@oregonstate.edu>
Link: https://lore.kernel.org/r/51edbcc7583d64d3fe5a203d3a8649a695ef4a75.1669872193.git.schofija@oregonstate.edu


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>