tweaks: drop two checks that were made redundant by the previous commit

src/files.c

@@ -604,7 +604,7 @@ void mention_name_and_linecount(void)
 void switch_to_adjacent_buffer(bool to_next)
 {
 	/* If only one file buffer is open, say so and get out. */
-	if (openfile == openfile->next && !inhelp) {
+	if (openfile == openfile->next) {
 		statusbar(_("No more open file buffers"));
 		return;
 	}
@@ -623,9 +623,6 @@ void switch_to_adjacent_buffer(bool to_next)
 	/* Update titlebar and multiline info to match the current buffer. */
 	prepare_for_display();
 
-	if (inhelp)
-		return;
-
 	/* Ensure that the main loop will redraw the help lines. */
 	currmenu = MMOST;