staging: r8188eu: remove spaces before tabs

Conform to Linux kernel coding style.

Reported by checkpatch:

WARNING: please, no space before tabs

Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
Link: https://lore.kernel.org/r/2fd10f393e3bc7381a85d0bfc1ec04a80af4eabb.1648888462.git.remckee0@gmail.com


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