(minor) fix invalid random seed

pkg/randseed/rand_seed.go

@@ -15,12 +15,12 @@ func init() {
 // GenSeed returns 64bit seed from crypto/rand source or
 // from current time, if crypto random error occurred
 func GenSeed() (seed int64) {
-	r := make([]byte, 0, 8)
+	r := make([]byte, 8)
 	if _, err := cr.Read(r); err == nil {
-		seed = time.Now().UnixNano()
-	} else {
 		seed = int64(r[0])<<56 | int64(r[1])<<48 | int64(r[2])<<40 | int64(r[3])<<32 |
 			int64(r[4])<<24 | int64(r[5])<<16 | int64(r[6])<<8 | int64(r[7])
+	} else {
+		seed = time.Now().UnixNano()
 	}
 	return
 }