tests/qtest: Avoid unaligned access in IGB test

tests/qtest: Avoid unaligned access in IGB test

  ../tests/qtest/libqos/igb.c:106:5: runtime error: load of misaligned address 0x562040be8e33 for type 'uint32_t', which requires 4 byte alignment

Instead of straight casting the uint8_t array, we can use ldl_le_p and
lduw_l_p to assure the unaligned access works properly against
uint32_t and uint16_t.

Signed-off-by: Nabih Estefan <nabihestefan@google.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250429155621.2028198-1-nabihestefan@google.com>
[AJB: fix commit message, remove unneeded casts]
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Message-ID: <20250603110204.838117-5-alex.bennee@linaro.org>