ao_coreaudio_exclusive: move code for getting original format

Should be almost equivalent, unless there are streams on which this call
does not work for unknown reasons.

(cherry picked from commit 8b4ca58062)

audio/out/ao_coreaudio_exclusive.c

@@ -433,12 +433,6 @@ static int init_digital(struct ao *ao, AudioStreamBasicDescription asbd)
         bool digital = ca_stream_supports_digital(ao, streams[i]);
 
         if (digital) {
-            err = CA_GET(streams[i], kAudioStreamPropertyPhysicalFormat,
-                         &p->original_asbd);
-            if (!CHECK_CA_WARN("could not get stream's physical format to "
-                               "revert to, getting the next one"))
-                continue;
-
             AudioStreamRangedDescription *formats;
             size_t n_formats;
 
@@ -485,6 +479,10 @@ static int init_digital(struct ao *ao, AudioStreamBasicDescription asbd)
         goto coreaudio_error;
     }
 
+    err = CA_GET(p->stream, kAudioStreamPropertyPhysicalFormat,
+                 &p->original_asbd);
+    CHECK_CA_ERROR("could not get stream's original physical format");
+
     if (!ca_change_format(ao, p->stream, p->stream_asbd))
         goto coreaudio_error;