FM_ChildSizeTimeMode doesn't clear FileMode on OS_stat failure

[skliper]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug
FileMode could be uninitilized when written if there's an OS_stat failure since it's not cleared:

FM/fsw/src/fm_child.c

Lines 1587 to 1610 in 9210c2d

	int32 FM_ChildSizeTimeMode(const char *Filename, uint32 *FileSize, uint32 *FileTime, uint32 *FileMode)
	{
	int32 Result = OS_SUCCESS;
	os_fstat_t FileStatus;
	memset(&FileStatus, 0, sizeof(FileStatus));
	Result = OS_stat(Filename, &FileStatus);
	if (Result != OS_SUCCESS)
	{
	*FileSize = 0;
	*FileTime = 0;
	}
	else
	{
	*FileTime = OS_FILESTAT_TIME(FileStatus);
	*FileSize = OS_FILESTAT_SIZE(FileStatus);
	*FileMode = OS_FILESTAT_MODE(FileStatus);
	}
	return (Result);
	} /* End of FM_ChildSizeTimeMode */

To Reproduce
Pass in uninitialized FileMode, observe not cleared on OS_stat failure.

Expected behavior
Should clear all values.

System observed on:
Observation

Additional context
Low likelihood of ever seeing this (maybe file deleted between directory read and OS_stat?), and just would write uninitialized data to the output.

Reporter Info
Jacob Hageman - NASA/GSFC