output/Thread: move code to method InternalCloseError()

src/output/Control.hxx

@@ -467,6 +467,14 @@ private:
 	void InternalClose(bool drain) noexcept;
 
 	/**
+	 * An error has occurred, and this output must be closed.
+	 */
+	void InternalCloseError(std::exception_ptr e) noexcept {
+		Failure(e);
+		InternalClose(false);
+	}
+
+	/**
 	 * Runs inside the OutputThread.
 	 * Caller must lock the mutex.
 	 */

src/output/Thread.cxx

@@ -232,8 +232,7 @@ try {
 } catch (...) {
 	FormatError(std::current_exception(),
 		    "Failed to filter for %s", GetLogName());
-	Failure(std::current_exception());
-	InternalClose(false);
+	InternalCloseError(std::current_exception());
 	return false;
 }
 
@@ -273,9 +272,7 @@ AudioOutputControl::PlayChunk() noexcept
 		} catch (...) {
 			FormatError(std::current_exception(),
 				    "Failed to play on %s", GetLogName());
-			Failure(std::current_exception());
-
-			InternalClose(false);
+			InternalCloseError(std::current_exception());
 			return false;
 		}