X *: Fix vet errors automatically found by Go1.10

go/neo/client/client.go

@@ -501,7 +501,7 @@ func openClientByURL(ctx context.Context, u *url.URL, opt *zodb.OpenOptions) (zo
 	// neo://name@master1,master2,...,masterN?options
 
 	if u.User == nil {
-		return nil, fmt.Errorf("neo: open %q: cluster name not specified")
+		return nil, fmt.Errorf("neo: open %q: cluster name not specified", u)
 	}
 
 	// XXX readonly stub

go/zodb/storage/fs1/index.go

@@ -292,7 +292,7 @@ loop:
 
 		// unpack entry tuple -> oidPrefix, fsBucket
 		if len(v) != 2 {
-			return nil, fmt.Errorf("invalid entry: len = %i", len(v))
+			return nil, fmt.Errorf("invalid entry: len = %d", len(v))
 		}
 
 		// decode oidPrefix
@@ -302,7 +302,7 @@ loop:
 			return nil, fmt.Errorf("invalid oidPrefix: type %T", xoidPrefixStr)
 		}
 		if l := len(oidPrefixStr); l != 6 {
-			return nil, fmt.Errorf("invalid oidPrefix: len = %i", l)
+			return nil, fmt.Errorf("invalid oidPrefix: len = %d", l)
 		}
 		copy(oidb[:], oidPrefixStr)
 		oidPrefix := zodb.Oid(binary.BigEndian.Uint64(oidb[:]))
@@ -314,7 +314,7 @@ loop:
 			return nil, fmt.Errorf("invalid fsBucket: type %T", xkvStr)
 		}
 		if l := len(kvStr); l%8 != 0 {
-			return nil, fmt.Errorf("invalid fsBucket: len = %i", l)
+			return nil, fmt.Errorf("invalid fsBucket: len = %d", l)
 		}
 
 		// load btree from fsBucket entries