staging: rtl8192e: convert else if sequence to switch

Convert a sequence of else if statements that all check the same
variable to a single switch statement. With a switch statement it is
easier to see what is going on. Additionally this clears a checkpatch
warning.

WARNING: braces {} are not necessary for any arm of this statement

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20230619150953.22484-3-straube.linux@gmail.com


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