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QSslDiffieHellmanParameters: fix mem-leak

Says ASAN:

Direct leak of 524 byte(s) in 1 object(s) allocated from:
#0 0x7f708f0a67cf in __interceptor_malloc ../../../../gcc/libsanitizer/asan/asan_malloc_linux.cpp:145
#1 0x7f707d94bf9e in CRYPTO_malloc crypto/mem.c:196
#2 0x7f707d7bd248 in asn1_item_flags_i2d crypto/asn1/tasn_enc.c:65
#3 0x7f707d7bd1b7 in ASN1_item_i2d crypto/asn1/tasn_enc.c:45
#4 0x7f707d85b7be in i2d_DHparams crypto/dh/dh_asn1.c:54
#5 0x7f7075a82223 in q_i2d_DHparams(dh_st*, unsigned char**) qsslsocket_openssl_symbols.cpp:435
#6 0x7f7075a82223 in QTlsBackendOpenSSL::dhParametersFromPem(QByteArray const&, QByteArray*) const qssldiffiehellmanparameters_openssl.cpp:139
#7 0x7f708ca9b588 in QSslDiffieHellmanParametersPrivate::initFromPem(QByteArray const&) qssldiffiehellmanparameters.cpp:285
#8 0x7f708ca9b588 in QSslDiffieHellmanParameters::fromEncoded(QByteArray const&, QSsl::EncodingFormat) qssldiffiehellmanparameters.cpp:94
#9 0x55fd8a545ebe in tst_QSslDiffieHellmanParameters::constructionPEM() tst_qssldiffiehellmanparameters.cpp:98

The pointer returned in the out-parameter of a i2d_DHparams() call is supposed to be OPENSSL_free()ed by the user (this is not at all obvious from the docs¹, but an SO answer² indicates that's how it should be (as well as asan stopping from complaining with this patch applied)).

¹ ²

Amends 2cf63c71.

[ChangeLog][QtNetwork][SSL] Fixed a memory leak in parsing of PEM-encoded Diffie-Hellman parameters.

Pick-to: 6.6 6.5 6.2 5.15 Change-Id: I9ed4a26c4676db1c0d54a1945a4fb5014ce568cd Reviewed-by: Mårten Nordheim Reviewed-by: Timur Pocheptsov (cherry picked from commit 676087ef)

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