Fix flowhash size computation for very large hash tables

Change-Id: Ieae4ff6429fc5bdcf0e243db40ab7ec00c30730a
Signed-off-by: Pierre Pfister <ppfister@cisco.com>
diff --git a/src/vppinfra/flowhash_template.h b/src/vppinfra/flowhash_template.h
index 8f8fef2..359b969 100644
--- a/src/vppinfra/flowhash_template.h
+++ b/src/vppinfra/flowhash_template.h
@@ -357,7 +357,7 @@
 FVT(flowhash) *FV(flowhash_alloc)(u32 fixed_entries, u32 collision_buckets)
 {
   FVT(flowhash) *h;
-  u32 size;
+  uword size;
   void *mem;
   u32 entries;