Staging: irda: Don't use assignment inside if statement

Write assignment statement outside of the if statement. Done
using the following semantic patch by coccinelle.

@@
identifier E;
expression F;
statement S;
@@

-if((E = F))
+E = F;
+if(E)
    S

Signed-off-by: Srishti Sharma <srishtishar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>