sweep/input: adds NewBaseInput to return reference

Author: cfromknecht

input/input.go

@@ -95,6 +95,18 @@ func MakeBaseInput(outpoint *wire.OutPoint, witnessType WitnessType,
 	}
 }
 
+// NewBaseInput allocates and assembles a new *BaseInput that can be used to
+// construct a sweep transaction.
+func NewBaseInput(outpoint *wire.OutPoint, witnessType WitnessType,
+	signDescriptor *SignDescriptor, heightHint uint32) *BaseInput {
+
+	input := MakeBaseInput(
+		outpoint, witnessType, signDescriptor, heightHint,
+	)
+
+	return &input
+}
+
 // CraftInputScript returns a valid set of input scripts allowing this output
 // to be spent. The returns input scripts should target the input at location
 // txIndex within the passed transaction. The input scripts generated by this