src: assignment to valid type

We are converting the argument to a uint32_t value
but the lvalue is not consistent with the casting.

PR-URL: https://github.com/nodejs/node/pull/32879


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>