Property: fix memory leak.

Coverity 1456008.
Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/10509)

crypto/property/property.c

@@ -546,9 +546,9 @@ int ossl_method_store_cache_set(OSSL_METHOD_STORE *store, int nid,
         }
         ossl_method_free(&p->method);
     }
-    OPENSSL_free(p);
 err:
     res = 0;
+    OPENSSL_free(p);
 end:
     ossl_property_unlock(store);
     return res;