Fix compiler warnings: remove incorrect address-of operator and add getpid for Windows

- etcp_connections.c:1142: remove & before addr in sockaddr_storage_to_str call
- test_etcp_simple_traffic.c: add #include <process.h> and #define getpid _getpid for Windows

src/etcp_connections.c

@@ -1139,7 +1139,7 @@ int etcp_send_ping(struct UTUN_INSTANCE* instance, const uint8_t* peer_pubkey_bi
         DEBUG_ERROR(DEBUG_CATEGORY_BGP, "no socket");
         return -2;
     }
-    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "ping N1 [%s]", sockaddr_storage_to_str(&addr).str);
+    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "ping N1 [%s]", sockaddr_storage_to_str(addr).str);
     return etcp_send_ping_to_socket(instance, e_sock, peer_pubkey_bin, addr, timeout_ms,
                                      cb, user_arg, user_data, user_data_len);
 }

tests/test_etcp_simple_traffic.c

@@ -6,6 +6,8 @@
 #ifdef _WIN32
 #include <windows.h>
 #include <direct.h>
+#include <process.h>
+#define getpid _getpid
 #else
 #include <unistd.h>
 #endif