Explicitly cast 0 to size_t type to match fread() return type. This follows the pattern used elsewhere in this file, and fixes -Wshorten-64-to-32 warnings when building the test.
Explicitly cast 0 to size_t type to match fread() return type. This follows the pattern used elsewhere in this file, and fixes -Wshorten-64-to-32 warnings when building the test.