shellcheck fixes

Author: schaefi

dracut/modules.d/55kiwi-dump/kiwi-dump-image.sh

@@ -483,9 +483,9 @@ function optimize_count_for_32k_blocksize {
     local count=$2
     local dump_bytes
     dump_bytes=$((block_size * count))
-    if [ $((${dump_bytes} % 32768)) -eq 0 ];then
+    if [ $((dump_bytes % 32768)) -eq 0 ];then
         # dump_bytes is a multiple of 32k, use it for better I/O performance
-        count=$((${dump_bytes} / 32768))
+        count=$((dump_bytes / 32768))
     fi
     echo "${count}"
 }