spring-projectsGH-3869: Implement requested changes in the advice during review.

Author: adel-haidar

spring-integration-file/src/main/java/org/springframework/integration/file/remote/session/ContextHolderRequestHandlerAdvice.java

@@ -87,31 +87,17 @@ public void setContextClearHook(Consumer<Object> contextClearHook) {
 
 	@Override
 	protected Object doInvoke(ExecutionCallback callback, Object target, Message<?> message) {
-		final var result = callback.execute();
 		applyKeyProvider(message);
-		return result;
+		return callback.execute();
 	}
 
 	private void applyKeyProvider(Message<?> message) {
-		if (this.keyProvider != null) {
-			final Object key = this.keyProvider.apply(message);
-			if (key != null) {
-				setContext(key);
-				clearContext(key);
-			}
-		}
+		final Object key = this.keyProvider.apply(message);
+		setContext(key);
 	}
 
 	private void setContext(Object key) {
-		if (this.contextSetHook != null) {
-			this.contextSetHook.accept(key);
-		}
-	}
-
-	private void clearContext(Object key) {
-		if (this.contextClearHook != null) {
-			this.contextClearHook.accept(key);
-		}
+		this.contextSetHook.accept(key);
 	}
 
 }