staging: rtl8192u: delete successive assignments to the same location

Successive assignments to the same location is meaningless and can be
deleted. The Coccinelle semantic patch was used to find cases.

@@
expression e1,e2,e3;
@@

(
 (<+...e1++...+>)=e2;
|
 (<+...e1--...+>)=e2;
|
 (<+...++e1...+>)=e2;
|
 (<+...--e1...+>)=e2;
|
e1=e2;
e1 = <+...e1...+>;
|
*e1=e2;
*e1=e3;
)

Signed-off-by: Jiayi Ye <yejiayily@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>