[SCSI] mpt2sas: add missing allocation check
The __get_free_pages can fail, so the return value should be checked. Spotted thanks to Stanislaw. Signed-off-by: Tomas Henzl <thenzl@redhat.com> Acked-by: "Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@lsi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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