clarify a comment, and don't try to display the buffer name in

die_save_file() if it's been blanked out by get_next_file()'s failure to
find a unique filename


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2573 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/files.c

@@ -402,7 +402,8 @@ char *get_next_filename(const char *name, const char *suffix)
 	sprintf(buf + namelen + suffixlen, ".%lu", i);
     }
 
-    /* We get here only if there is no possible save file. */
+    /* We get here only if there is no possible save file.  Blank out
+     * the filename to indicate this. */
     null_at(&buf, 0);
 
     return buf;