xapi-stdext-threads: fix ipq test

The out of bounds test fails when updating libraries

Signed-off-by: Pau Ruiz Safont <pau.ruizsafont@cloud.com>

Author: psafont

ocaml/libs/xapi-stdext/lib/xapi-stdext-threads/ipq_test.ml

@@ -19,7 +19,7 @@ let test_out_of_index () =
   let q = Ipq.create 10 0 in
   Ipq.add q {Ipq.ev= 123; Ipq.time= Mtime_clock.elapsed ()} ;
   let is_oob = function
-    | Invalid_argument s when String.ends_with ~suffix:"  out of bounds" s ->
+    | Invalid_argument s when String.ends_with ~suffix:" out of bounds" s ->
         true
     | _ ->
         false