Fix stackoverflow due to recursion in vfs_spiffs_readdir_r #2212
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Current implementation of vfs_spiffs_readdir_r() has an issue with recursion. In the case where you have N consecutive files in /folder1/ and you're reading /folder2/, vfs_spiffs_readdir_r() gets recursively called N times. When N get sufficiently large (in my case around 35), stack overflows.
I updated vfs_spiffs_readdir_r() to use a do/while loop instead.
NOTE: I did not extensively test this beyond my specific use case.