Remove CommigSig.Absent helper

Signed-off-by: Thane Thomson <connect@thanethomson.com>

types/block.go

@@ -622,11 +622,6 @@ func NewCommitSigAbsent() CommitSig {
 	}
 }
 
-// Absent returns true if CommitSig is absent.
-func (cs CommitSig) Absent() bool {
-	return cs.BlockIDFlag == BlockIDFlagAbsent
-}
-
 // CommitSig returns a string representation of CommitSig.
 //
 // 1. first 6 bytes of signature

types/validation.go

@@ -36,7 +36,7 @@ func VerifyCommit(chainID string, vals *ValidatorSet, blockID BlockID,
 	votingPowerNeeded := vals.TotalVotingPower() * 2 / 3
 
 	// ignore all absent signatures
-	ignore := func(c CommitSig) bool { return c.Absent() }
+	ignore := func(c CommitSig) bool { return c.BlockIDFlag == BlockIDFlagAbsent }
 
 	// only count the signatures that are for the block
 	count := func(c CommitSig) bool { return c.BlockIDFlag == BlockIDFlagCommit }