target-mips: Do not check CPU_INTERRUPT_TIMER.

This bit is never set, therefore we should not read it either.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

target-mips/exec.h

@@ -29,10 +29,6 @@ static inline int cpu_has_work(CPUState *env)
         has_work = 1;
     }
 
-    if (env->interrupt_request & CPU_INTERRUPT_TIMER) {
-        has_work = 1;
-    }
-
     return has_work;
 }