http.c: remove redundant check
http.c: remove redundant check

cause it is already checked in cb_context_alloc

Change-Id: I402dc96e205323ed9ebacbb78ce8f3be8628cd52
Reviewed-on: http://review.couchbase.org/23344
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

dewolfe/couchbase-ruby-client,dewolfe/couchbase-ruby-client