target/xtensa: don't announce exit simcall

Don't announce that exit simcall has been invoked: this is just noise.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

target/xtensa/xtensa-semi.c

@@ -202,7 +202,6 @@ void HELPER(simcall)(CPUXtensaState *env)
 
     switch (regs[2]) {
     case TARGET_SYS_exit:
-        qemu_log("exit(%d) simcall\n", regs[3]);
         exit(regs[3]);
         break;