Replace explicit use of PooledDataBuffer.release()

spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java

@@ -504,7 +504,7 @@ public abstract class DataBufferUtils {
 				catch (IllegalStateException ex) {
 					// Avoid dependency on Netty: IllegalReferenceCountException
 					if (logger.isDebugEnabled()) {
-						logger.debug("Failed to release PooledDataBuffer", ex);
+						logger.debug("Failed to release PooledDataBuffer: " + dataBuffer, ex);
 					}
 					return false;
 				}

spring-web/src/main/java/org/springframework/http/codec/multipart/PartHttpMessageWriter.java

@@ -26,6 +26,7 @@ import org.springframework.core.ResolvableType;
 import org.springframework.core.codec.Hints;
 import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.io.buffer.PooledDataBuffer;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
@@ -66,7 +67,7 @@ public class PartHttpMessageWriter extends MultipartWriterSupport implements Htt
 		Flux<DataBuffer> body = Flux.from(parts)
 				.concatMap(part -> encodePart(boundary, part, outputMessage.bufferFactory()))
 				.concatWith(generateLastLine(boundary, outputMessage.bufferFactory()))
-				.doOnDiscard(PooledDataBuffer.class, PooledDataBuffer::release);
+				.doOnDiscard(PooledDataBuffer.class, DataBufferUtils::release);
 
 		return outputMessage.writeWith(body);
 	}