tweaks: close a buffer differently and elide a parameter

src/files.c

@@ -462,8 +462,7 @@ bool open_buffer(const char *filename, bool new_buffer)
 				/* When not overriding an existing lock, discard the buffer. */
 				if (do_lockfile(realname) < 0) {
 #ifdef ENABLE_MULTIBUFFER
-					openfile = openfile->prev;
-					close_buffer(openfile->next);
+					close_buffer();
 #endif
 					free(realname);
 					return FALSE;
@@ -645,10 +644,11 @@ void switch_to_next_buffer(void)
 	switch_to_adjacent_buffer(FORWARD);
 }
 
-/* Remove the given buffer from the circular list of buffers. */
-void close_buffer(openfilestruct *buffer)
+/* Remove the current buffer from the circular list of buffers. */
+void close_buffer(void)
 {
-	unlink_opennode(buffer);
+	openfile = openfile->prev;
+	unlink_opennode(openfile->next);
 
 	/* When just one buffer remains open, show "Exit" in the help lines. */
 	if (openfile == openfile->next)

src/help.c

@@ -223,9 +223,8 @@ void do_help(void)
 		}
 	}
 
-	/* Switch back to the original buffer and discard the help-text buffer. */
-	openfile = openfile->prev;
-	close_buffer(openfile->next);
+	/* Discard the help-text buffer. */
+	close_buffer();
 
 	/* Restore the settings of all flags. */
 	memcpy(flags, stash, sizeof(flags));

src/nano.c

@@ -1044,7 +1044,9 @@ void close_and_go(void)
 							openfile->current->lineno, xplustabs() + 1);
 #endif
 		switch_to_next_buffer();
-		close_buffer(openfile->prev);
+		openfile = openfile->prev;
+		close_buffer();
+		openfile = openfile->next;
 		/* Adjust the count in the top bar. */
 		titlebar(NULL);
 	} else

src/proto.h

@@ -276,7 +276,7 @@ void prepare_for_display(void);
 void mention_name_and_linecount(void);
 void switch_to_prev_buffer(void);
 void switch_to_next_buffer(void);
-void close_buffer(openfilestruct *buffer);
+void close_buffer(void);
 #endif
 void read_file(FILE *f, int fd, const char *filename, bool undoable);
 int open_file(const char *filename, bool newfie, FILE **f);

src/winio.c

@@ -3374,8 +3374,7 @@ void total_refresh(void)
 		titlebar(title);
 #ifdef ENABLE_HELP
 	if (inhelp) {
-		openfile = openfile->prev;
-		close_buffer(openfile->next);
+		close_buffer();
 		wrap_help_text_into_buffer();
 	} else
 #endif