This time free the memory returned by crypt() only once. This way
the leak is avoided and also double free error is avoided also.
The patch fixes the following valgrind compaint:

 43 bytes in 1 blocks are still reachable in loss record 1 of 1
    at 0x4026844: malloc (vg_replace_malloc.c:263)
    by 0x40268BE: realloc (vg_replace_malloc.c:632)
    by 0x41EE411: __md5_crypt (in /lib/libcrypt-2.13.so)
    by 0x41EDA56: crypt (in /lib/libcrypt-2.13.so)
    by 0x805F702: newcamd_login (camd-newcamd.c:297)
    by 0x9F0B10: ???

With this patch valgrind compains about leaked 43 bytes but
without the patch glibc reports double free the second time
newcamd_login() is called and crashes the program. Since the
leak is not bad (it is a static buffer allocated by glibc) just
ignore valgrind in this case.