configury: do fail lustre detection when llapi_file_create() is not found

The result of this test was previously and incorrectly ignored.

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

config/ompi_check_lustre.m4

@@ -12,7 +12,7 @@ dnl Copyright (c) 2004-2006 The Regents of the University of California.
 dnl                         All rights reserved.
 dnl Copyright (c) 2009-2017 Cisco Systems, Inc.  All rights reserved
 dnl Copyright (c) 2008-2018 University of Houston. All rights reserved.
-dnl Copyright (c) 2015      Research Organization for Information Science
+dnl Copyright (c) 2015-2018 Research Organization for Information Science
 dnl                         and Technology (RIST).  All rights reserved.
 dnl $COPYRIGHT$
 dnl
@@ -63,7 +63,8 @@ AC_DEFUN([OMPI_CHECK_LUSTRE],[
                 [ompi_check_lustre_happy="yes"],
                 [ompi_check_lustre_happy="no"])
             
-            AC_MSG_CHECKING([for required lustre data structures])
+            AS_IF([test "$ompi_check_lustre_happy" = "yes"],
+                  [AC_MSG_CHECKING([for required lustre data structures])
                    cat > conftest.c <<EOF
 #include "lustre/lustreapi.h"
 void alloc_lum()
@@ -84,7 +85,7 @@ OPAL_LOG_COMMAND(
                         ompi_check_lustre_happy="no"]
                    )
                        rm -f conftest.c conftest.o
-    AC_MSG_RESULT([$ompi_check_lustre_struct_happy])
+                       AC_MSG_RESULT([$ompi_check_lustre_struct_happy])])
     ])
 
     AS_IF([test "$ompi_check_lustre_happy" = "yes"],