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rather than blindly continuing and possibly using negative values. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> CC: Ian Campbell <Ian.Campbell@citrix.com> CC: Ian Jackson <Ian.Jackson@eu.citrix.com> CC: Wei Liu <wei.liu2@citrix.com> CC: Dave Scott <dave.scott@eu.citrix.com> Acked-by: David Scott <dave.scott@citrix.com> (cherry picked from commit3380f5b627) (cherry picked from commitc91ed889ea) (cherry picked from commit10a95535b0)