Refactor mutually exclusive if in TO_LAB_init()

[thnkslprpt]

Describe the bug
Mutually exclusive logic in this if, else if, and also no final else clause which I believe is frowned upon in the coding guidelines.

Code snips

to_lab/fsw/src/to_lab_app.c

Lines 203 to 215 in 7ca124c

	for (i = 0; (i < (sizeof(TO_LAB_Subs->Subs) / sizeof(TO_LAB_Subs->Subs[0]))); i++)
	{
	if (!CFE_SB_IsValidMsgId(TO_LAB_Subs->Subs[i].Stream))
	{
	/* Only process until invalid MsgId (aka TO_LAB_UNUSED) is found*/
	break;
	}
	else if (CFE_SB_IsValidMsgId(TO_LAB_Subs->Subs[i].Stream))
	{
	status = CFE_SB_SubscribeEx(TO_LAB_Subs->Subs[i].Stream, TO_LAB_Global.Tlm_pipe, TO_LAB_Subs->Subs[i].Flags,
	TO_LAB_Subs->Subs[i].BufLimit);
	}

Expected behavior
Refactor into a simpler if, else block.

Reporter Info
Avi Weiss @thnkslprpt