Extraneous assignments to CFE_SUCCESS

[thnkslprpt]

Checklist

• 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
DS has a few extraneous assignments to CFE_SUCCESS as in nasa/HS#10

Code snips

DS/fsw/src/ds_file.c

Lines 343 to 351 in d08de30

	void DS_FileWriteData(int32 FileIndex, const void *FileData, uint32 DataLength)
	{
	DS_AppFileStatus_t *FileStatus = &DS_AppData.FileStatus[FileIndex];
	int32 Result = CFE_SUCCESS;
	/*
	** Let cFE manage the file I/O...
	*/
	Result = OS_write(FileStatus->FileHandle, FileData, DataLength);

DS/fsw/src/ds_file.c

Lines 762 to 772 in d08de30

	void DS_FileUpdateHeader(int32 FileIndex)
	{
	#if (DS_FILE_HEADER_TYPE == DS_FILE_HEADER_CFE)
	/*
	** Update CFE specific header fields...
	*/
	DS_AppFileStatus_t *FileStatus = &DS_AppData.FileStatus[FileIndex];
	CFE_TIME_SysTime_t CurrentTime = CFE_TIME_GetTime();
	int32 Result = CFE_SUCCESS;
	Result = OS_lseek(FileStatus->FileHandle, sizeof(CFE_FS_Header_t), OS_SEEK_SET);

Expected behavior
Remove assignments - unnecessary code.

Reporter Info
Avi Weiss @thnkslprpt