Fix mocks.c build error (#864)

Signed-off-by: Ryan Mills <r.mills@ngc.com>

test/mocks.c

diff --git a/test/mocks.c b/test/mocks.c
index 35d4720..b3560f0 100644
--- a/test/mocks.c
+++ b/test/mocks.c
@@ -124,7 +124,7 @@
     check_expected_ptr(dma);
     check_expected_ptr(dma_addr);
     check_expected_uint(size);
-    check_expected_int(fd);
+    check_expected_ptr(fd);
     check_expected_int(offset);
     check_expected_uint(prot);
     check_expected_int(access_mode);