Minor redundancy cleanup from static analysis warnings

[skliper]

Is your feature request related to a problem? Please describe.
Two minor redundant logic/checks:

osal/src/os/vxworks/src/os-impl-timebase.c

Lines 397 to 411 in ff4f523

	for (signo = SIGRTMIN; signo <= SIGRTMAX; ++signo)
	{
	if (!sigismember(&inuse, signo))
	{
	/* signal is available, stop search */
	break;
	}
	}
	if (signo < SIGRTMIN || signo > SIGRTMAX)
	{
	/* no available signal for timer */
	OS_DEBUG("No free RT signals to use for simulated time base\n");
	return_code = OS_TIMER_ERR_UNAVAILABLE;
	}

osal/src/os/vxworks/src/os-impl-network.c

Line 88 in ff4f523

status = OS_SUCCESS;

No actual issues, just minor cleanup.

Describe the solution you'd like
Remove first, refactor second so the bound is just checked in one place

Describe alternatives you've considered
None

Additional context
Static analysis warnings

Requester Info
Jacob Hageman - NASA