When dump/pre-dump failed before initializing vmas, free_mappings(&vmas)
is called and this cause segfault. Lets initialize vmas in the very
beginning of dump.
Signed-off-by: Ruslan Kuprieiev <kurpuser@gmail.com>

seqfault.patch
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>