staging: rtl8192e: rename rateIndex to rate_index

Rename the variable rateIndex in the function
_rtl92e_update_received_rate_histogram_stats() to avoid camel case.

rateIndex -> rate_index

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20240222112723.18428-2-straube.linux@gmail.com


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