Fix print format for size_t

Fix following compilation issues on 32 bit platform

hostapd/src/ap/ieee802_11_eht.c:959:6: error: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Werror,-Wformat]
                   common_info_len);
                   ^~~~~~~~~~~~~~~
hostapd/src/ap/ieee802_11_eht.c:1130:7: error: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Werror,-Wformat]
                           link_info->nstr_bitmap_len);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~

Using %zu ensures consistent output across different platforms and
compilers, regardless of the underlying size of size_t.

Bug: 317188936
Test: m
Change-Id: Ibdd90dba18de0f3b1d14711afcdad523a85682e5
diff --git a/src/ap/ieee802_11_eht.c b/src/ap/ieee802_11_eht.c
index 1d17518..c1ccda4 100644
--- a/src/ap/ieee802_11_eht.c
+++ b/src/ap/ieee802_11_eht.c
@@ -955,7 +955,7 @@
 		goto out;
 	}
 
-	wpa_printf(MSG_DEBUG, "MLD: expected_common_info_len=%lu",
+	wpa_printf(MSG_DEBUG, "MLD: expected_common_info_len=%zu",
 		   common_info_len);
 
 	if (sizeof(*ml) + common_info_len > ml_len) {
@@ -1125,7 +1125,7 @@
 		ml_len -= sub_elem_len;
 
 		wpa_printf(MSG_DEBUG, "MLD: link ctrl=0x%x, " MACSTR
-			   ", nstr bitmap len=%lu",
+			   ", nstr bitmap len=%zu",
 			   control, MAC2STR(link_info->peer_addr),
 			   link_info->nstr_bitmap_len);