ch: Avoid memleak in virCHDriverConfigDispose()

ch: Avoid memleak in virCHDriverConfigDispose()

When virCHDriverConfig struct is initialized in
virCHDriverConfigNew() the 'configDir' member is allocated but
corresponding free is missing in virCHDriverConfigDispose().
While at it, reorder the free calls to match the order in which
they are declared in the struct so it's easier to spot missing
free call.

20 bytes in 1 blocks are definitely lost in loss record 667 of 2,033
   at 0x4912888: malloc (vg_replace_malloc.c:446)
   by 0x5436747: __vasprintf_internal (in /usr/lib64/libc.so.6)
   by 0x503EC81: g_vasprintf (in /usr/lib64/libglib-2.0.so.0.8400.3)
   by 0x500805B: g_strdup_vprintf (in /usr/lib64/libglib-2.0.so.0.8400.3)
   by 0x5008124: g_strdup_printf (in /usr/lib64/libglib-2.0.so.0.8400.3)
   by 0xB8C2B70: virCHDriverConfigNew (ch_conf.c:181)
   by 0xB8C9DDA: chStateInitialize (ch_driver.c:1456)
   by 0x4D9E316: virStateInitialize (libvirt.c:667)
   by 0x40539DB: daemonRunStateInit (remote_daemon.c:581)
   by 0x4AC1EB4: virThreadHelper (virthread.c:256)
   by 0x5441DE3: start_thread (in /usr/lib64/libc.so.6)
   by 0x54C25F3: clone (in /usr/lib64/libc.so.6)

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>