IPv4: Require "inet" promise for ioctl() on an IPv4Socket

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/35c84504cd4

Kernel/Net/IPv4Socket.cpp

@@ -435,6 +435,7 @@ KResult IPv4Socket::getsockopt(FileDescription& description, int level, int opti
 
 int IPv4Socket::ioctl(FileDescription&, unsigned request, unsigned arg)
 {
+    REQUIRE_PROMISE(inet);
     auto* ifr = (ifreq*)arg;
     if (!current->process().validate_read_typed(ifr))
         return -EFAULT;