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Pointer to variable that will the receive return error code from this function:
FS_ERR_NONE
File lock acquired.
FS_ERR_NULL_PTR
Argument p_file passed a NULL pointer.
FS_ERR_INVALID_TYPE
Argument p_file's type is invalid or unknown.
FS_ERR_FILE_NOT_OPEN
File not open.
FS_ERR_FILE_NOT_LOCKED
File not locked or locked by different task.
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