[Patch] MediaJack.cpp: fix gcc6 build

[mt]

In CORTEX_NAMESPACE compareTypeAndID(), gcc6 warns '-Werror=tautological-compare'. It seems there is same variable comparison at line 783 and 787.

C++ /home/haiku/haiku/haiku/generated-gcc6/objects/haiku/x86/release/apps/cortex/MediaRoutingView/MediaJack.o 
/home/haiku/haiku/haiku/src/apps/cortex/MediaRoutingView/MediaJack.cpp: In function 'int compareTypeAndID(const void*, const void*)':
/home/haiku/haiku/haiku/src/apps/cortex/MediaRoutingView/MediaJack.cpp:783:25: error: self-comparison always evaluates to false [-Werror=tautological-compare]
   if (lJack->m_jackType < lJack->m_jackType)
       ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
/home/haiku/haiku/haiku/src/apps/cortex/MediaRoutingView/MediaJack.cpp:787:25: error: self-comparison always evaluates to true [-Werror=tautological-compare]
   if (lJack->m_jackType == lJack->m_jackType)
       ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors

[Barrett]

Applied in hrev50294. Thanks!