gtls: check the return value of gnutls_pubkey_init() #19362
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This PR adds a check for the return value of gnutls_pubkey_init().
According to the source code of gnutls_pubkey_init(), it returns a negative error value on error and
keywill be NULL.However, according to the source of gnutls_pubkey_import_x509(), gnutls_pubkey_import_x509() would not check the validity of
key.Therefore, I believe that it is necessary to check the return value of gnutls_pubkey_init().