Make sure no read routine process more than INT_MAX packets.

Make sure no read routine process more than INT_MAX packets.

Some read routines don't read a single bufferful of packets and process
just those packets; if packets continue to be made available, they could
conceivably process an arbitrary number of packets.

That would mean that the packet count overflows; either that makes it
look like a negative number, making it look as if an error occurred, or
makes it look like a too-small positive number.

This can't be fixed by making the count 64-bit, as it ultimately gets
returned by pcap_dispatch(), which is defined to return an int.

Instead, if the maximum packet count argument to those routines is a
value that means "no maximum", we set the maximum to INT_MAX.  Those
routines are *not* defined to loop forever, so this isn't an issue.

This should fix issue #1087.