wolfssl: fix build for wolfssl without bio chain support

[jay]

• Do not mix declarations and code. (ISO C90 build error)

Ref: #22252 (comment)

Closes #xxxx

---

../../lib/vtls/wolfssl.c: In function 'wssl_connect_step1':
../../lib/vtls/wolfssl.c:1542:3: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
 1542 |   curl_socket_t sockfd = Curl_conn_cf_get_socket(cf, data);
      |   ^~~~~~~~~~~~~

[testclutch]

Analysis of PR #22255 at 60f9534f:

Test 593 failed, which has NOT been flaky recently, so there could be a real issue in this PR. Note that this test has failed in 10 different CI jobs (the link just goes to one of them).

Test 311 failed, but it has been 0.6% flaky lately, so it's probably NOT a fault of the PR. Note that this test has failed in 12 different CI jobs (the link just goes to one of them).

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