misc: initialize memory before using in tests

valgrind complains about accessing not inialized data.

Running test copy...==4327== Conditional jump or move depends on uninitialised value(s)
==4327==    at 0x484E89E: bcmp (vg_replace_strmem.c:1234)
==4327==    by 0x485D217: cmp (util.c:41)
==4327==    by 0x485CE3C: ioctl (mock.c:188)
==4327==    by 0x4870D1A: nvme_submit_passthru32 (ioctl.c:136)
==4327==    by 0x4870EC3: nvme_submit_io_passthru (ioctl.c:183)
==4327==    by 0x405595: test_copy (misc.c:1014)
==4327==    by 0x406968: run_test (misc.c:1382)
==4327==    by 0x406BF4: main (misc.c:1433)

Signed-off-by: Daniel Wagner <[email protected]>

Author: igaw

libnvme/test/ioctl/misc.c

@@ -989,7 +989,7 @@ static void test_copy(void)
 
 	_cleanup_free_ struct nvme_copy_range *copy = NULL;
 
-	copy = malloc(copy_size);
+	copy = calloc(1, copy_size);
 	check(copy, "copy: ENOMEM");
 
 	struct mock_cmd mock_io_cmd = {