Remove now-redundant check.

We now check much earlier for an invalid message length; remove the
check done afterwards.

Also, note that dissect_netlink_error() should also check the message
length, to make sure it doesn't run past the end of the message, and
indicate why we are assuming an "integer" is 4 bytes (it's because the
RFC is vague here).

Change-Id: Ie0b5074acc852cdeaa008fee1125130a6c8771a1
Reviewed-on: https://code.wireshark.org/review/17279
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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