hw/timer/imx_epit: don't shadow variable

Fix issue reported by Coverity.

Signed-off-by: Axel Heider <axel.heider@hensoldt.net>
Message-id: 168070611775.20412.2883242077302841473-1@git.sr.ht
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 542fd43)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/timer/imx_epit.c

@@ -179,7 +179,7 @@ static void imx_epit_update_compare_timer(IMXEPITState *s)
          * the compare value. Otherwise it may fire at most once in the
          * current round.
          */
-        bool is_oneshot = (limit >= s->cmp);
+        is_oneshot = (limit >= s->cmp);
         if (counter >= s->cmp) {
             /* The compare timer fires in the current round. */
             counter -= s->cmp;