process.c: fix typo in non-SIGCHLD waitpid :x

I expect this to fix [Bug #14873]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

process.c

@@ -1106,7 +1106,7 @@ waitpid_no_SIGCHLD(struct waitpid_state *w)
     }
     else {
         do {
-            rb_thread_call_without_gvl(waitpid_blocking_no_SIGCHLD, &w,
+            rb_thread_call_without_gvl(waitpid_blocking_no_SIGCHLD, w,
                                        RUBY_UBF_PROCESS, 0);
         } while (w->ret < 0 && errno == EINTR && (RUBY_VM_CHECK_INTS(w->ec),1));
     }