pipeline: simple: Avoid overusage of auto variables

Using auto variables for simple types reduces readability. Spell out
unsigned int explicitly here, and replace the <= 0 check with a zero
check now that the explicit type shows the value can't be negative.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <uajain@igalia.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/pipeline/simple/simple.cpp

@@ -1266,8 +1266,8 @@ CameraConfiguration::Status SimpleCameraConfiguration::validate()
 			cfg.frameSize = format.planes[0].size;
 		}
 
-		const auto bufferCount = cfg.bufferCount;
-		if (bufferCount <= 0)
+		const unsigned int bufferCount = cfg.bufferCount;
+		if (!bufferCount)
 			cfg.bufferCount = kNumBuffersDefault;
 		else if (bufferCount > kNumBuffersMax)
 			cfg.bufferCount = kNumBuffersMax;