Fix asan finding in bio_tfo_test

Running bio_tfo_test under asan yields
==172342==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 380 byte(s) in 5 object(s) allocated from:
    #0 0x3ff89bba251 in malloc (/lib64/libasan.so.8+0xba251)
    #1 0x3ff88cf9fd5 in gaih_inet.constprop.0 (/lib64/libc.so.6+0xf9fd5)
    #2 0x3ff88cfaf6f in getaddrinfo (/lib64/libc.so.6+0xfaf6f)
    #3 0x3ff89ba52a9 in __interceptor_getaddrinfo.part.0 (/lib64/libasan.so.8+0xa52a9)
    #4 0x1004909 in test_fd_tfo test/bio_tfo_test.c:241
[...]

and fails the test.

Fix this by freeing the return addrinfo on exit.

Signed-off-by: Juergen Christ <jchrist@linux.ibm.com>

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from #18979)

test/bio_tfo_test.c

@@ -400,6 +400,8 @@ static int test_fd_tfo(int idx)
         if (errstr != NULL)
             BIO_printf(bio_err, "last errno: %d=%s\n", sockerr, errstr);
     }
+    if (ai != NULL)
+        freeaddrinfo(ai);
     BIO_ADDR_free(baddr);
     BIO_closesocket(cfd);
     BIO_closesocket(sfd);