don't let remove_magicline() remove the magicline if it's the only line

in the file


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2077 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/utils.c

@@ -444,7 +444,7 @@ void new_magicline(void)
 /* Remove the magicline from filebot, if there is one. */
 void remove_magicline(void)
 {
-    if (filebot->data[0] == '\0') {
+    if (filebot->data[0] == '\0' && filebot->prev != NULL) {
 	filebot = filebot->prev;
 	free_filestruct(filebot->next);
 	filebot->next = NULL;