various: replace some OOM handling

We prefer to fail fast rather than degrade in unpredictable ways.
The example in sub/ is particularly egregious because the code just
skips the work it's meant to do when an allocation fails.

audio/out/ao_coreaudio_utils.c

@@ -471,10 +471,8 @@ bool ca_change_physical_format_sync(struct ao *ao, AudioStreamID stream,
     ca_print_asbd(ao, "setting stream physical format:", &change_format);
 
     mp_sem_t wakeup;
-    if (mp_sem_init(&wakeup, 0, 0)) {
-        MP_WARN(ao, "OOM\n");
-        return false;
-    }
+    if (mp_sem_init(&wakeup, 0, 0))
+        MP_HANDLE_OOM(0);
 
     AudioStreamBasicDescription prev_format;
     err = CA_GET(stream, kAudioStreamPropertyPhysicalFormat, &prev_format);

sub/img_convert.c

@@ -31,7 +31,8 @@
 void mp_blur_rgba_sub_bitmap(struct sub_bitmap *d, double gblur)
 {
     struct mp_image *tmp1 = mp_image_alloc(IMGFMT_BGRA, d->w, d->h);
-    if (tmp1) { // on OOM, skip region
+    MP_HANDLE_OOM(tmp1);
+    {
         struct mp_image s = {0};
         mp_image_setfmt(&s, IMGFMT_BGRA);
         mp_image_set_size(&s, d->w, d->h);

video/filter/vf_vdpaupp.c

@@ -74,8 +74,7 @@ static void vf_vdpaupp_process(struct mp_filter *f)
 
     struct mp_image *mpi =
         mp_vdpau_mixed_frame_create(mp_refqueue_get_field(p->queue, 0));
-    if (!mpi)
-        return; // OOM
+    MP_HANDLE_OOM(mpi);
     struct mp_vdpau_mixer_frame *frame = mp_vdpau_mixed_frame_get(mpi);
 
     if (!mp_refqueue_should_deint(p->queue)) {

video/out/x11_common.c

@@ -1372,8 +1372,7 @@ static void vo_x11_sizehint(struct vo *vo, struct mp_rect rc, bool override_pos)
                      override_pos;                  // for fullscreen and such
 
     XSizeHints *hint = XAllocSizeHints();
-    if (!hint)
-        return; // OOM
+    MP_HANDLE_OOM(hint);
 
     hint->flags |= PSize | (force_pos ? PPosition : 0);
     hint->x = rc.x0;