net: leaseshelper: Refactor copying of old entries to avoid double free
When copying entries from the old lease file into the new array the old code would copy the pointer of the json object into the second array without removing it from the first. Afterwards when both arrays were freed this might lead to a crash due to access of already freed memory. Refactor the code to use the new array item stealing helper added to the json code so that the entry resides just in one array.
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