sdpcontext: Fix check for ipv6 address type
sdpcontext: Fix check for ipv6 address type

Change-Id: Ia1b84c4d63689f27dfdfbfc5f4df31063cc8c013

Kurento/kms-core,Kurento/kms-core,ESTOS/kms-core,ESTOS/kms-core,ESTOS/kms-core,Kurento/kms-core,ESTOS/kms-core,Kurento/kms-core