internal/deephash: fix accidental naked return

name              old time/op    new time/op    delta
Hash-8              23.0µs ± 1%    22.4µs ± 0%   -2.43%  (p=0.008 n=5+5)
HashMapAcyclic-8    24.0µs ± 0%    23.8µs ± 0%   -0.56%  (p=0.008 n=5+5)

name              old alloc/op   new alloc/op   delta
Hash-8              2.92kB ± 0%    2.49kB ± 0%  -14.80%  (p=0.000 n=5+4)
HashMapAcyclic-8    2.53kB ± 0%    2.53kB ± 0%     ~     (all equal)

name              old allocs/op  new allocs/op  delta
Hash-8                93.0 ± 0%      86.0 ± 0%   -7.53%  (p=0.008 n=5+5)
HashMapAcyclic-8       202 ± 0%       202 ± 0%     ~     (all equal)

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

internal/deephash/deephash.go

@@ -114,7 +114,7 @@ func print(w *bufio.Writer, v reflect.Value, visited map[uintptr]bool) (acyclic
 				x := v.Interface().(tailcfg.DiscoKey)
 				w.Write(x[:])
 			}
-			return
+			return true
 		}
 	}