Fix 1 << -1 in JOB_MASK macro

Calling JOB_MASK(QEMU_JOB_NONE) would result in 1 << -1.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/libxl/libxl_domain.h

@@ -30,7 +30,7 @@
 # include "libxl_conf.h"
 # include "virchrdev.h"
 
-# define JOB_MASK(job)                  (1 << (job - 1))
+# define JOB_MASK(job)                  (job == 0 ? 0 : 1 << (job - 1))
 # define DEFAULT_JOB_MASK               \
     (JOB_MASK(LIBXL_JOB_DESTROY) |      \
      JOB_MASK(LIBXL_JOB_ABORT))

src/qemu/qemu_domain.h

@@ -50,7 +50,7 @@
 #  define QEMU_DOMAIN_MIG_BANDWIDTH_MAX (INT64_MAX / (1024 * 1024))
 # endif
 
-# define JOB_MASK(job)                  (1 << (job - 1))
+# define JOB_MASK(job)                  (job == 0 ? 0 : 1 << (job - 1))
 # define QEMU_JOB_DEFAULT_MASK          \
     (JOB_MASK(QEMU_JOB_QUERY) |         \
      JOB_MASK(QEMU_JOB_DESTROY) |       \