ib_srpt: Fix nightly build

srpt/conftest/pd_has_local_dma_lkey/Makefile

@@ -0,0 +1,3 @@
+LINUXINCLUDE := $(PRE_CFLAGS) $(LINUXINCLUDE)
+
+obj-m += pd_has_local_dma_lkey.o

srpt/conftest/pd_has_local_dma_lkey/pd_has_local_dma_lkey.c

@@ -0,0 +1,10 @@
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <rdma/ib_verbs.h>
+
+static int modinit(void)
+{
+	return offsetof(struct ib_pd, local_dma_lkey);
+}
+
+module_init(modinit);