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coverity fix 286920
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@ -122,6 +122,7 @@ int preferences_save(void) {
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char* backupFilename = (char *)calloc(fnLen, sizeof(uint8_t));
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if (backupFilename == NULL) {
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PrintAndLogEx(ERR, "failed to allocate memory");
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free(fn);
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return PM3_EMALLOC;
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}
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snprintf(backupFilename, fnLen, "%s.bak", fn);
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