compile warning fix

tests/mobject-client-test.c

@@ -86,7 +86,7 @@ int main(int argc, char** argv)
 
         // print the results of the read operations
         printf("Client received the following results:\n");
-        printf("stat: psize=%ld pmtime=%lld prval=%d\n", psize, pmtime, prval1);
+        printf("stat: psize=%ld pmtime=%lld prval=%d\n", psize, (long long)pmtime, prval1);
         {
             printf("read: bytes_read = %ld, prval=%d content: ", bytes_read, prval2);
             unsigned i;