staging: r8188eu: replace ternary operator with min, max, abs macros

Replace some ternary operators with the min(), max() or abs() macros
to improve readability.

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/20221031153743.8801-1-straube.linux@gmail.com


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