preparatory patch for -Wwrite-strings #2

include/libbb.h

@@ -248,6 +248,8 @@ extern void bb_copyfd_exact_size(int fd1, int fd2, off_t size);
 /* this helper yells "short read!" if param is not -1 */
 extern void complain_copyfd_and_die(off_t sz) ATTRIBUTE_NORETURN;
 extern char bb_process_escape_sequence(const char **ptr);
+/* TODO: sometimes modifies its parameter, which
+ * makes it rather inconvenient at times: */
 extern char *bb_get_last_path_component(char *path);
 extern int ndelay_on(int fd);
 extern int ndelay_off(int fd);