Checking the value of xch->xcall is clearly incorrect. The code should be
checking xch->fmem (i.e. the return of the previously called function).
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>