dlmalloc: honor 8 byte alignment requests

Change-Id: Ie504603c2e42cae3ad592952b2b166919420e5f7
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/src/vppinfra/dlmalloc.c b/src/vppinfra/dlmalloc.c
index 53caa3f..60bd8d5 100644
--- a/src/vppinfra/dlmalloc.c
+++ b/src/vppinfra/dlmalloc.c
@@ -4173,7 +4173,7 @@
   /* 
    * Alignment requests less than the size of an mmx vector are ignored 
    */
-  if (align < 16) {
+  if (align < sizeof (uword)) {
     rv = mspace_malloc (msp, n_user_data_bytes);
     if (rv == 0)
         return rv;