Kernel: Add NetworkingManagement::try_for_each() for fallible iteration

This API will allow users to short circuit iteration and properly
propagate errors.

Kernel/Net/NetworkingManagement.cpp

@@ -50,6 +50,15 @@ void NetworkingManagement::for_each(Function<void(NetworkAdapter&)> callback)
     });
 }
 
+ErrorOr<void> NetworkingManagement::try_for_each(Function<ErrorOr<void>(NetworkAdapter&)> callback)
+{
+    return m_adapters.with([&](auto& adapters) -> ErrorOr<void> {
+        for (auto& adapter : adapters)
+            TRY(callback(adapter));
+        return {};
+    });
+}
+
 RefPtr<NetworkAdapter> NetworkingManagement::from_ipv4_address(IPv4Address const& address) const
 {
     if (address[0] == 0 && address[1] == 0 && address[2] == 0 && address[3] == 0)

Kernel/Net/NetworkingManagement.h

@@ -31,6 +31,7 @@ public:
     NetworkingManagement();
 
     void for_each(Function<void(NetworkAdapter&)>);
+    ErrorOr<void> try_for_each(Function<ErrorOr<void>(NetworkAdapter&)>);
 
     RefPtr<NetworkAdapter> from_ipv4_address(const IPv4Address&) const;
     RefPtr<NetworkAdapter> lookup_by_name(StringView) const;