Invalid read return value fix#7817
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earlephilhower merged 2 commits intoesp8266:masterfrom Jan 9, 2021
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Fixes esp8266#7814. Return 0, not MAXINT, when a read is called on a File without a backing instance of a SPIFFS/LittleFS/SD File.
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Fixes #7814.
Return 0, not MAXINT, when a read is called on a File without a backing
instance of a SPIFFS/LittleFS/SD File.