Silence warnings about pointer casting

This commit was SVN r29226.

opal/mca/db/pmi/db_pmi.c

@@ -357,9 +357,14 @@ static bool cache_keys_locally (const opal_identifier_t *uid, const char *key)
 
         /* cache value locally so we don't have to look it up via pmi again */
         if (OPAL_BYTE_OBJECT == stored_type) {
-            opal_byte_object_t bo = {.bytes = (unsigned char *) (size == 0xffff) ? NULL : tmp3,
-                                     .size = (size == 0xffff) ? 0 : size};
-
+            opal_byte_object_t bo;
+            if (size == 0xffff) {
+                bo.bytes = NULL;
+                bo.size = 0;
+            } else {
+                bo.bytes = (uint8_t*)tmp3;
+                bo.size = size;
+            }
             opal_db.store (uid, OPAL_DB_INTERNAL, tmp_val + offset, &bo, stored_type);
         } else if (size < 0xffff) {
             opal_db.store (uid, OPAL_DB_INTERNAL, tmp_val + offset, tmp3, stored_type);