samples: kdbus: kdbus-workers: Define dummy prime_new()

[Chen Gang]

Quite a few of architures (e.g. blackfin, cris, frv ...) do not support
memfd_create system call which is used in prime_new(). So define a dummy
one.

The related error (with allmodconfig under blackfin):

    CC [M]  samples/kfifo/inttype-example.o
  samples/kdbus/kdbus-workers.c: In function âprime_newâ:
  samples/kdbus/kdbus-workers.c:930:18: error: â__NR_memfd_createâ undeclared (first use in this function)
    p->fd = syscall(__NR_memfd_create, "prime-area", MFD_CLOEXEC);
                    ^
  samples/kdbus/kdbus-workers.c:930:18: note: each undeclared identifier is reported only once for each function it appears in
  make[2]: *** [samples/kdbus/kdbus-workers] Error 1

Signed-off-by: Chen Gang <gang.chen.5i5j@xxxxxxxxx>
---
 samples/kdbus/kdbus-workers.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/samples/kdbus/kdbus-workers.c b/samples/kdbus/kdbus-workers.c
index d331e01..0affd23 100644
--- a/samples/kdbus/kdbus-workers.c
+++ b/samples/kdbus/kdbus-workers.c
@@ -910,6 +910,8 @@ exit:
  *
  */
 
+#ifdef __NR_memfd_create
+
 static int prime_new(struct prime **out)
 {
 	struct prime *p;
@@ -954,6 +956,15 @@ error:
 	return r;
 }
 
+#else
+
+static int prime_new(struct prime **out)
+{
+	return err("the architecture does not support memfd_create");
+}
+
+#endif
+
 static void prime_free(struct prime *p)
 {
 	if (!p)
-- 
1.9.3
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