tweaks: elide a function that is used just once and is a oneliner

src/files.c

@@ -62,7 +62,7 @@ bool has_valid_path(const char *filename)
 /* Add an item to the circular list of openfile structs. */
 void make_new_buffer(void)
 {
-	openfilestruct *newnode = make_new_opennode();
+	openfilestruct *newnode = nmalloc(sizeof(openfilestruct));
 
 	if (openfile == NULL) {
 		/* Make the first open file the only element in the list. */

src/nano.c

@@ -502,12 +502,6 @@ void copy_from_buffer(filestruct *somebuffer)
 	ingraft_buffer(the_copy);
 }
 
-/* Create a new openfile node. */
-openfilestruct *make_new_opennode(void)
-{
-	return (openfilestruct *)nmalloc(sizeof(openfilestruct));
-}
-
 #ifdef ENABLE_MULTIBUFFER
 /* Unlink a node from the rest of the circular list, and delete it. */
 void unlink_opennode(openfilestruct *fileptr)

src/proto.h

@@ -398,7 +398,6 @@ void extract_buffer(filestruct **file_top, filestruct **file_bot,
 		filestruct *top, size_t top_x, filestruct *bot, size_t bot_x);
 void ingraft_buffer(filestruct *somebuffer);
 void copy_from_buffer(filestruct *somebuffer);
-openfilestruct *make_new_opennode(void);
 #ifdef ENABLE_MULTIBUFFER
 void unlink_opennode(openfilestruct *fileptr);
 void delete_opennode(openfilestruct *fileptr);