staging: rts5208: use ternary operators to reduce indentation level

Convert code in format of if (a) if(b) { [...] } to one line with a
simple ternary operation to avoid unnecesary increase of indentation
level.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>