j2k.cpp > comparison of address of 'p_j2k->m_cp.tcps[0].m_data' not equal to a null pointer is always true

[bommo1]

latest commit.
Compilation fails with AppleClang 8.1.0.8020042:

j2k.cpp:9244:34: error: comparison of address of 'p_j2k->m_cp.tcps[0].m_data' not equal to a null pointer is always true [-Werror,-Wtautological-pointer-compare]
&p_j2k->m_cp.tcps[0].m_data != NULL) {
~~~~~~~~~~~~~~~~~~~~^~~~~~ ~~~~

[rouault]

Fixed. Thanks