otr: smpFailureError processing tlvTypeSMP3 prevents sending tlvTypeSMP4
otr: smpFailureError processing tlvTypeSMP3 prevents sending tlvTypeSMP4

 * The other side is left hanging, waiting for their chance to do the
   comparison.

Change-Id: I186933ebb53a30e190414c5572206851681e0a37
Reviewed-on: https://go-review.googlesource.com/15260
Reviewed-by: Adam Langley <db68fba232b2c49ed3e9d3081df349dde7b61dfd@golang.org>

kim-racktop/crypto,bford/golang-x-crypto,mattharden/crypto,cmars/tools,cmars/tools,cmars/tools,golang/crypto,ScriptRock/crypto,golang/crypto,bford/golang-x-crypto,golang/crypto,kim-racktop/crypto,ScriptRock/crypto,thomaso-mirodin/crypto,cmars/tools,mattharden/crypto,thomaso-mirodin/crypto