Coverity issues in gsm_rlcmac.cpp

Dear Ivan,

could you please have a look at the coverity issues in the gsm_rlcmac.cpp routines?

Uninitialized scalar variable: gsm_rlcmac.cpp:5321 ar.direction not initialized gsm_rlcmac.cpp:5039 ar.direction not initialized gsm_rlcmac.cpp:5155 ar.direction not initialized gsm_rlcmac.cpp:4872 ar.direction not initialized

Just initialize it in csnStreamInit?

Out-of-bounds read: gsm_rlcmac.cpp:5502 " Overrunning array "data->RLC_DATA" of 20 bytes at byte offset 22 using index "i" (which evaluates to 22)."

gsm_rlcmac.cpp:5440 " Overrunning array "data->RLC_DATA" of 20 bytes at byte offset 22 using index "i" (which evaluates to 22)."

Maybe just add an assert that dataNumOctets <= 20?