add missing free()

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2272 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/nano.c

@@ -1362,6 +1362,8 @@ void do_next_word(void)
 	current_x = 0;
     }
 
+    free(char_mb);
+
     if (current == NULL)
 	current = filebot;