vppinfra: fix bihash key comparison for 512-bits vectors

bihash keys are less than 64-bytes, do not overflow.

Type: fix

Change-Id: Ic55407eb9ccca38058f7e62b363ec05c8445fbcb
Signed-off-by: Benoît Ganne <bganne@cisco.com>
diff --git a/src/vppinfra/bihash_48_8.h b/src/vppinfra/bihash_48_8.h
index 54fd709..928b102 100644
--- a/src/vppinfra/bihash_48_8.h
+++ b/src/vppinfra/bihash_48_8.h
@@ -78,8 +78,8 @@
 clib_bihash_key_compare_48_8 (u64 * a, u64 * b)
 {
 #if defined (CLIB_HAVE_VEC512)
-  u64x8 v = u64x8_load_unaligned (a) ^ u64x8_load_unaligned (b);
-  return (u64x8_is_zero_mask (v) & 0x3f) == 0;
+  return u64x8_is_equal (u64x8_mask_load_zero (a, 0x3f),
+			 u64x8_mask_load_zero (b, 0x3f));
 #elif defined (CLIB_HAVE_VEC256)
   u64x4 v = { 0 };
   v = u64x4_insert_lo (v, u64x2_load_unaligned (a + 4) ^