libcamera: ipu3: Remove dead code check

Since the re-implementation of the IPU3 pipeline handler
configuration procedure, the main output is always assigned in
case any YUV stream is requested.

Remove a dead code block that checks for the main output to be
valid.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/pipeline/ipu3/ipu3.cpp

@@ -506,12 +506,6 @@ int PipelineHandlerIPU3::configure(Camera *camera, CameraConfiguration *c)
 	 * the configuration of the active one for that purpose (there should
 	 * be at least one active stream in the configuration request).
 	 */
-	if (!mainCfg) {
-		ret = imgu->configureOutput(*vfCfg, &outputFormat);
-		if (ret)
-			return ret;
-	}
-
 	if (!vfCfg) {
 		ret = imgu->configureViewfinder(*mainCfg, &outputFormat);
 		if (ret)