libxl: create: style: Add a pair of missing { ]

From CODING_STYLE:

  Every indented statement is braced, but blocks that contain just one
  statement may have the braces omitted.  To avoid confusion, either all
  the blocks in an if...else chain have braces, or none of them do.

CC: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/libxl/libxl_create.c

@@ -68,8 +68,9 @@ int libxl__domain_create_info_setdefault(libxl__gc *gc,
         c_info->passthrough = ((c_info->type == LIBXL_DOMAIN_TYPE_PV) ||
                                !info.cap_iommu_hap_pt_share) ?
             LIBXL_PASSTHROUGH_SYNC_PT : LIBXL_PASSTHROUGH_SHARE_PT;
-    } else if (!info.cap_hvm_directio)
+    } else if (!info.cap_hvm_directio) {
         c_info->passthrough = LIBXL_PASSTHROUGH_DISABLED;
+    }
 
     /* An explicit setting should now have been chosen */
     assert(c_info->passthrough != LIBXL_PASSTHROUGH_UNKNOWN);