Remove compile warning about assinging to itself
Remove compile warning about assinging to itself

warning: explicitly assigning a variable of type 'couchstore_error_t' to itself [-Wself-assign]
    do { if((errcode = (errcode)) < 0) { goto cleanup; } } while (0);
             ~~~~~~~ ^  ~~~~~~~

Change-Id: I97fadb7a4fc5aa66d6c3bc66634937d4223046d1
Reviewed-on: http://review.couchbase.org/31021
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>

abhinavdangeti/couchstore,abhinavdangeti/couchstore,vmx/couchstore,couchbaselabs/couchstore,t3rm1n4l/couchstore,t3rm1n4l/couchstore,jimwwalker/couchstore,vmx/couchstore,vmx/couchstore,couchbaselabs/couchstore,abhinavdangeti/couchstore,couchbaselabs/couchstore,jimwwalker/couchstore,t3rm1n4l/couchstore,jimwwalker/couchstore