We can safely cast the data in a GArray to gpointer first, and then
to the pointer type we require.
tests/test-helpers.c: In function 'mm_test_helpers_compare_bands':
tests/test-helpers.c:41:47: error: cast increases required alignment of target type [-Werror=cast-align]
bands_str = mm_common_build_bands_string ((MMModemBand *)(bands->data), bands->len);
^
tests/test-helpers.c:46:56: error: cast increases required alignment of target type [-Werror=cast-align]
expected_bands_str = mm_common_build_bands_string ((MMModemBand *)(expected_bands_array->data), expected_bands_array->len);
^
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