gh-76961: Fix buildbot failures in test_pep3118 (#101587)

This PR fixes the buildbot failures introduced by the merge of #5561, by restricting the relevant tests to something that should work on both 32-bit and 64-bit platforms. It also silences some compiler warnings introduced in that PR.

1 files changed, 3 insertions, 3 deletions

diff --git a/Modules/_ctypes/stgdict.c b/Modules/_ctypes/stgdict.c
index dac772e..83a5275 100644
--- a/Modules/_ctypes/stgdict.c
+++ b/Modules/_ctypes/stgdict.c
@@ -339,7 +339,7 @@ MakeAnonFields(PyObject *type)
 
 /*
   Allocate a memory block for a pep3118 format string, copy prefix (if
-  non-null) into it and append `{padding}x` to the end. 
+  non-null) into it and append `{padding}x` to the end.
   Returns NULL on failure, with the error indicator set.
 */
 char *
@@ -355,8 +355,8 @@ _ctypes_alloc_format_padding(const char *prefix, Py_ssize_t padding)
         return _ctypes_alloc_format_string(prefix, "x");
     }
 
-    int ret = PyOS_snprintf(buf, sizeof(buf), "%zdx", padding);
-    assert(0 <= ret && ret < sizeof(buf));
+    int ret = PyOS_snprintf(buf, sizeof(buf), "%zdx", padding); (void)ret;
+    assert(0 <= ret && ret < (Py_ssize_t)sizeof(buf));
     return _ctypes_alloc_format_string(prefix, buf);
 }