Bug 57669

The man page for ifmib(4) gives a code sample defining a function
get_ifmib_general().  This function uses the sysctl(3) function, but
with incorrect parameters.  The 4th parameter to sysctl(3) is the
_address_ of a location to read and store the size of the data;
however the example code places the actual size here, not the _location_
of the size.  The code will therefore give compilation warnings and
likely fail if run.

Fix: 

One way to fix it would be to declare a variable
	size_t len;

and replace the given sysctl() line with 2 lines:

	len = sizeof(*ifmd);
	return sysctl(name, 6, ifmd, &len, (void *)0, 0);
How-To-Repeat: Enter the code from the example, attempt to compile it with warnings
enabled.