Return COUCHSTORE_SUCCESS when not freeing docinfo
Return COUCHSTORE_SUCCESS when not freeing docinfo

This fixes a regression from commit
9b3dad6f47cfe2bf5055512c720f5d535ed7139f

Change-Id: Ib8b92e1188549bc9ac96f943e3b6f0f7d238548f
Reviewed-on: http://review.couchbase.org/17725
Reviewed-by: Jin Lim <c45cd80a556f432a3607171a6818cd5a074b5cd4@couchbase.com>
Tested-by: Aaron Miller <41fcc51335f382e0855796cc35dd33f571f2d8f7@ninjawhale.com>

couchbaselabs/couchstore,vmx/couchstore,hsharsha/couchstore,vmx/couchstore,jimwwalker/couchstore,hsharsha/couchstore,abhinavdangeti/couchstore,couchbaselabs/couchstore-specials,couchbaselabs/couchstore-specials,abhinavdangeti/couchstore,couchbaselabs/couchstore-specials,vmx/couchstore,couchbaselabs/couchstore,abhinavdangeti/couchstore,couchbaselabs/couchstore-specials,t3rm1n4l/couchstore,couchbaselabs/couchstore,t3rm1n4l/couchstore,hsharsha/couchstore,jimwwalker/couchstore,couchbaselabs/couchstore-specials,jimwwalker/couchstore,t3rm1n4l/couchstore,hsharsha/couchstore