staging: vt6655: fix camelcase byData in card.c

Replace camelcase variable "byData" into linux kernel coding style
equivalent variable "data" in card.c.
"by" prefix in hungarian notation stands for byte or unsigned char

References:
https://www.kernel.org/doc/html/latest/process/coding-style.html
https://www.cse.iitk.ac.in/users/dsrkg/cs245/html/Guide.htm



Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Link: https://lore.kernel.org/r/20211106184822.24242-1-tomm.merciai@gmail.com


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