drm/i915/audio: Unify get_saved_enc()

Make the two branches of get_saved_enc() look alike. Currently
they look different even though they do exactly the same thing
apart from == vs. != for the MST comparison.

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221108151839.31567-4-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_audio.c

@@ -1129,10 +1129,10 @@ static int i915_audio_component_get_cdclk_freq(struct device *kdev)
 static struct intel_encoder *get_saved_enc(struct drm_i915_private *i915,
 					   int port, int pipe)
 {
-	struct intel_encoder *encoder;
-
 	/* MST */
 	if (pipe >= 0) {
+		struct intel_encoder *encoder;
+
 		if (drm_WARN_ON(&i915->drm,
 				pipe >= ARRAY_SIZE(i915->display.audio.encoder_map)))
 			return NULL;
@@ -1143,7 +1143,7 @@ static struct intel_encoder *get_saved_enc(struct drm_i915_private *i915,
 		 * MST or not. So it will poll all the port & pipe
 		 * combinations
 		 */
-		if (encoder != NULL && encoder->port == port &&
+		if (encoder && encoder->port == port &&
 		    encoder->type == INTEL_OUTPUT_DP_MST)
 			return encoder;
 	}
@@ -1153,14 +1153,12 @@ static struct intel_encoder *get_saved_enc(struct drm_i915_private *i915,
 		return NULL;
 
 	for_each_pipe(i915, pipe) {
-		encoder = i915->display.audio.encoder_map[pipe];
-		if (encoder == NULL)
-			continue;
+		struct intel_encoder *encoder;
 
-		if (encoder->type == INTEL_OUTPUT_DP_MST)
-			continue;
+		encoder = i915->display.audio.encoder_map[pipe];
 
-		if (port == encoder->port)
+		if (encoder && encoder->port == port &&
+		    encoder->type != INTEL_OUTPUT_DP_MST)
 			return encoder;
 	}