Initialize some Kyber client variables

[gojimmypi]

Description

Similar to #7364 this PR initializes some Kyber variables, this time encountered as TLS client.

These warnings surfaced when implementing a Kyber client test on the ESP8266:

C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c: In function 'wc_KyberKey_MakeKeyWithRandom':
C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c:273:15: error: 'e' may be used uninitialized in this function [-Werror=maybe-uninitialized]
         ret = kyber_get_noise(&key->prf, kp, key->priv, e, NULL, noiseSeed);
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c: In function 'wc_KyberKey_Decapsulate':
C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c:822:42: error: 'fail' may be used uninitialized in this function [-Werror=maybe-uninitialized]
             kr[i] ^= (kr[i] ^ key->z[i]) & fail;
                      ~~~~~~~~~~~~~~~~~~~~^~~~~~
C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c: In function 'wc_KyberKey_EncapsulateWithRandom':
C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c:50:33: error: 'ctSz' may be used uninitialized in this function [-Werror=maybe-uninitialized]
 #define KYBER_HASH_H            wc_Sha3_256Hash
                                 ^~~~~~~~~~~~~~~
C:/workspace/wolfssl-gojimmypi-pr/wolfcrypt/src/wc_kyber.c:531:18: note: 'ctSz' was declared here
     unsigned int ctSz;
                  ^~~~
cc1.exe: some warnings being treated as errors

Fixes zd# n/a

Testing

How did you test?

Tested with command-line Linux apps talking to ESP32 Server. ESP8266 client appears to be working, but I have not yet been able to inspect with WireShark.

Enable Kyber in user_settings.h:

#define WOLFSSL_EXPERIMENTAL_SETTINGS
#define WOLFSSL_HAVE_KYBER
#define WOLFSSL_WC_KYBER
#define WOLFSSL_SHA3

or from command-line:

./configure --enable-kyber=all --enable-experimental

Talk to ESP32 Server from Linux client:

./examples/client/client -h 192.168.1.38 -v 4 \
                         -l TLS_AES_128_GCM_SHA256 \
                         --pqc KYBER_LEVEL5

Listen from Linux Server:

./examples/server/server -v 4 \
                         -l TLS_AES_128_GCM_SHA256 
                         --pqc KYBER_LEVEL5

Blog coming soon.

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[gojimmypi]

Jenkins retest this please