SDL: wasapi: More fixes for Clang warnings.

https://github.com/libsdl-org/SDL/commit/7f4488f625a5e0defd16bc45a37ea5fb19449de9

From 7f4488f625a5e0defd16bc45a37ea5fb19449de9 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Sat, 22 Jul 2023 14:49:55 -0400
Subject: [PATCH] wasapi: More fixes for Clang warnings.

---
 src/audio/wasapi/SDL_wasapi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/audio/wasapi/SDL_wasapi.c b/src/audio/wasapi/SDL_wasapi.c
index c76bc93805d7..2041bc88b47e 100644
--- a/src/audio/wasapi/SDL_wasapi.c
+++ b/src/audio/wasapi/SDL_wasapi.c
@@ -125,7 +125,7 @@ int WASAPI_ProxyToManagementThread(ManagementThreadTask task, void *userdata, in
 
     // add to end of task list.
     ManagementThreadPendingTask *prev = NULL;
-    for (ManagementThreadPendingTask *i = SDL_AtomicGetPtr(&ManagementThreadPendingTasks); i != NULL; i = i->next) {
+    for (ManagementThreadPendingTask *i = SDL_AtomicGetPtr((void **) &ManagementThreadPendingTasks); i != NULL; i = i->next) {
         prev = i;
     }
 
@@ -658,7 +658,7 @@ static int mgmtthrtask_PrepDevice(void *userdata)
 // This is called once a device is activated, possibly asynchronously.
 int WASAPI_PrepDevice(SDL_AudioDevice *device)
 {
-    int rc;
+    int rc = 0;
     return (WASAPI_ProxyToManagementThread(mgmtthrtask_PrepDevice, device, &rc) < 0) ? -1 : rc;
 }