hang in qemu_gluster_init

In qemu_gluster_init, if the call to either glfs_set_volfile_server or glfs_set_logging fails into the "out" case, glfs_fini is called without having first calling glfs_init.  This causes glfs_lock to spin forever on this bit:

	while (!fs->init)
		pthread_cond_wait (&fs->cond, &fs->mutex);

And here's the bottom part of the backtrace when hung:

#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:183
#1  0x00007feceebf58c3 in glfs_lock (fs=0x7fecf15660b0) at glfs-internal.h:156
#2  glfs_active_subvol (fs=0x7fecf15660b0) at glfs-resolve.c:799
#3  0x00007feceebeb5b4 in glfs_fini (fs=0x7fecf15660b0) at glfs.c:652
#4  0x00007fecf0043c73 in qemu_gluster_init (gconf=<value optimized out>, filename=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/block/gluster.c:229

I believe this can be fixed by simply moving the call to glfs_init after the call to glfs_new but before the calls to glfs_set_volfile_server or glfs_set_logging.