DirectoryReader: rename Failed() to HasFailed() for consistency with TextFile

src/Mapper.cxx

@@ -100,7 +100,7 @@ check_directory(const char *path_utf8, const Path &path_fs)
 #endif
 
 	const DirectoryReader reader(path_fs);
-	if (reader.Failed() && errno == EACCES)
+	if (reader.HasFailed() && errno == EACCES)
 		g_warning("No permission to read directory: %s", path_utf8);
 }
 

src/fs/DirectoryReader.hxx

@@ -47,14 +47,14 @@ public:
 	 * Destroys this instance.
 	 */
 	~DirectoryReader() {
-		if (!Failed())
+		if (!HasFailed())
 			closedir(dirp);
 	}
 
 	/**
 	 * Checks if directory failed to open. 
 	 */
-	bool Failed() const {
+	bool HasFailed() const {
 		return dirp == nullptr;
 	}
 
@@ -62,7 +62,7 @@ public:
 	 * Checks if directory entry is available.
 	 */
 	bool HasEntry() const {
-		assert(!Failed());
+		assert(!HasFailed());
 		return ent != nullptr;
 	}
 
@@ -70,7 +70,7 @@ public:
 	 * Reads next directory entry.
 	 */
 	bool ReadEntry() {
-		assert(!Failed());
+		assert(!HasFailed());
 		ent = readdir(dirp);
 		return HasEntry();
 	}