uprobes: Fix utask->xol_vaddr leak in pre_ssout()
pre_ssout() should do xol_free_insn_slot() if arch_uprobe_pre_xol() fails, otherwise nobody will free the allocated slot. Signed-off-by:Oleg Nesterov <oleg@redhat.com> Acked-by:
Anton Arapov <anton@redhat.com> Acked-by:
Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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