testsuite/xeno-test: reduce rounds of memory allocation checks

The tests exercizing the memory allocator may run for several minutes
each depending on the platform, in order to obtain reliable
performance figures. Reduce this amount of runtime for a basic
functional validation of those allocators.

testsuite/xeno-test/xeno-test.in

@@ -73,7 +73,7 @@ echo 0 > /proc/xenomai/latency || :
 
 testdir=@testdir@
 
-$testdir/smokey --run $keep_going
+$testdir/smokey --run $keep_going random_alloc_rounds=64 pattern_check_rounds=64
 $testdir/clocktest -D -T 30 -C CLOCK_HOST_REALTIME || $testdir/clocktest -T 30
 $testdir/switchtest -T 30