etc: modify adb_run_wrapper.sh to avoid 'expr' unrecognization at some android devices

diff --git a/src/etc/adb_run_wrapper.sh b/src/etc/adb_run_wrapper.sh
index fb1e0937fc920510a029564c14bd2068a9f06b3a..29d328c857d959dfade2a433a8d5301e74499e7e 100755 (executable)
--- a/src/etc/adb_run_wrapper.sh
+++ b/src/etc/adb_run_wrapper.sh
@@ -26,7 +26,7 @@ then
                /system/bin/sleep $WAIT
                /system/bin/sync
             fi
-            L_COUNT=`expr $L_COUNT+1`
+            L_COUNT=$((L_COUNT+1))
         done
 
         echo $L_RET > $PATH/$RUN.exitcode