update go-git to v4.12.0 - fixes #7248 (#7249)

vendor/gopkg.in/src-d/go-git.v4/utils/binary/read.go

@@ -25,6 +25,10 @@ func Read(r io.Reader, data ...interface{}) error {
 
 // ReadUntil reads from r untin delim is found
 func ReadUntil(r io.Reader, delim byte) ([]byte, error) {
+	if bufr, ok := r.(*bufio.Reader); ok {
+		return ReadUntilFromBufioReader(bufr, delim)
+	}
+
 	var buf [1]byte
 	value := make([]byte, 0, 16)
 	for {
@@ -44,6 +48,17 @@ func ReadUntil(r io.Reader, delim byte) ([]byte, error) {
 	}
 }
 
+// ReadUntilFromBufioReader is like bufio.ReadBytes but drops the delimiter
+// from the result.
+func ReadUntilFromBufioReader(r *bufio.Reader, delim byte) ([]byte, error) {
+	value, err := r.ReadBytes(delim)
+	if err != nil || len(value) == 0 {
+		return nil, err
+	}
+
+	return value[:len(value)-1], nil
+}
+
 // ReadVariableWidthInt reads and returns an int in Git VLQ special format:
 //
 // Ordinary VLQ has some redundancies, example:  the number 358 can be