net: Add IPv4ToString (we already have IPv6ToString)

src/netaddress.cpp

@@ -551,6 +551,11 @@ enum Network CNetAddr::GetNetwork() const
     return m_net;
 }
 
+static std::string IPv4ToString(Span<const uint8_t> a)
+{
+    return strprintf("%u.%u.%u.%u", a[0], a[1], a[2], a[3]);
+}
+
 static std::string IPv6ToString(Span<const uint8_t> a)
 {
     assert(a.size() == ADDR_IPV6_SIZE);
@@ -582,7 +587,7 @@ std::string CNetAddr::ToStringIP() const
                 return std::string(name);
         }
         if (m_net == NET_IPV4) {
-            return strprintf("%u.%u.%u.%u", m_addr[0], m_addr[1], m_addr[2], m_addr[3]);
+            return IPv4ToString(m_addr);
         }
         return IPv6ToString(m_addr);
     }