staging: greybus: Fix blank line style issue in sdio.c

This change fixes a checkpatch check for "Please don't use
multiple blank lines".

Signed-off-by: Amrit Khera <amritkhera98@gmail.com>
Link: https://lore.kernel.org/r/20210219144230.32055-1-amritkhera98@gmail.com


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