Backport 2.28: Avoid use of `ip_len` as it clashes with a macro in AIX system headers

Fixes #8624

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/include/mbedtls/net_sockets.h b/include/mbedtls/net_sockets.h
index 2d3fe3f..1a12c9c 100644
--- a/include/mbedtls/net_sockets.h
+++ b/include/mbedtls/net_sockets.h
@@ -140,7 +140,7 @@
  * \param client_ctx Will contain the connected client socket
  * \param client_ip Will contain the client IP address, can be NULL
  * \param buf_size  Size of the client_ip buffer
- * \param ip_len    Will receive the size of the client IP written,
+ * \param cip_len   Will receive the size of the client IP written,
  *                  can be NULL if client_ip is null
  *
  * \return          0 if successful, or
@@ -153,7 +153,7 @@
  */
 int mbedtls_net_accept(mbedtls_net_context *bind_ctx,
                        mbedtls_net_context *client_ctx,
-                       void *client_ip, size_t buf_size, size_t *ip_len);
+                       void *client_ip, size_t buf_size, size_t *cip_len);
 
 /**
  * \brief          Check and wait for the context to be ready for read/write