opj_jp2_read_header: Check for error after parsing header.

Consider the case where the caller has not set the p_image
pointer to NULL before calling opj_read_header().

If opj_j2k_read_header_procedure() fails while obtaining the rest
of the marker segment when calling opj_stream_read_data() because
the data stream is too short, then opj_j2k_read_header() will
never have the chance to initialize p_image, leaving it
uninitialized.

opj_jp2_read_header() will check the p_image value whether
opj_j2k_read_header() suceeded or failed. This may be detected as
an error in valgrind or ASAN.

The fix is to check whether opj_j2k_read_header() suceeded before
using the output argument p_image.

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