==4176== Invalid read of size 4
==4176==    at 0x8053DD0: do_mousebind (event.c:48)
==4176==    by 0x8054120: buttonpress (event.c:106)
==4176==    by 0x806980D: mainloop (wmfs.c:162)
==4176==    by 0x806A62F: main (wmfs.c:471)
==4176==  Address 0x456a144 is 0 bytes after a block of size 4 alloc'd
==4176==    at 0x4026416: calloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==4176==    by 0x8066DCD: xcalloc (util.c:66)
==4176==    by 0x80519F0: conf_tag_section (config.c:578)
==4176==    by 0x8053384: init_conf (config.c:841)
==4176==    by 0x805B30E: init (init.c:212)
==4176==    by 0x806A625: main (wmfs.c:469