ALSA: aloop: Avoid pointer dereference before null-check

Static analysis tools (cppcheck and PVS Studio) report an error
in loopback_snd_timer_period_elapsed() regarding dpcm_play pointer
dereference earlier than its null-check. And although this is a result
of a formal check, and the pointer correctness is also protected
by having a corresponding bit set in the "running" mask, re-ordering
of the lines can imake the code even formally correct and eliminate
those static analysis error reports.

Fixes: 26c53379f98d ("ALSA: aloop: Support selection of snd_timer instead of jiffies")
Reported-by: Eugeniu Rosca <[e-mail]>
Signed-off-by: Andrew Gabbasov <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/drivers/aloop.c

···
 
 	dpcm_play = cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
 	dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE];
-	substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
-			dpcm_play->substream : NULL;
-	substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ?
-			dpcm_capt->substream : NULL;
 
 	if (event == SNDRV_TIMER_EVENT_MSTOP) {
 		if (!dpcm_play ||
···
 		}
 	}
 
+	substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
+			dpcm_play->substream : NULL;
+	substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ?
+			dpcm_capt->substream : NULL;
 	valid_runtime = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
 				dpcm_play->substream->runtime :
 				dpcm_capt->substream->runtime;