crypt32/tests: Avoid size_t in traces.

dlls/crypt32/tests/protectdata.c

@@ -235,7 +235,7 @@ static void test_simpleroundtrip(const char *plaintext)
 
     res = pCryptUnprotectData(&encrypted, NULL, NULL, NULL, NULL, 0, &output);
     ok(res != 0, "can't unprotect; last error %u\n", GetLastError());
-    ok(output.cbData == strlen(plaintext), "output wrong length %d for input '%s', wanted %d\n", output.cbData, plaintext, strlen(plaintext));
+    ok(output.cbData == strlen(plaintext), "output wrong length %d for input '%s', wanted %d\n", output.cbData, plaintext, lstrlenA(plaintext));
     ok(!memcmp(plaintext, (char *)output.pbData, output.cbData), "output wrong contents for input '%s'\n", plaintext);
     LocalFree(output.pbData);
     LocalFree(encrypted.pbData);