staging: r8188eu: clean up camel case in odm_query_rxpwrpercentage()

Rename the variable 'AntPower' in odm_query_rxpwrpercentage() to avoid
camel case.

AntPower -> antpower

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220911161949.11293-6-straube.linux@gmail.com


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