minor: remove a CPPCHECK error for NR RLC

This "error" is not a real error.
openair2/LAYER2/nr_rlc/tests/test.c includes testXX.h to define the array
int test[] and by design test[2] always exists.

Let's simply suppress the reporting of this error.

ci-scripts/cppcheck_suppressions.list

@@ -84,6 +84,12 @@ nullPointer:common/utils/T/tracer/multi.c:265
 arrayIndexOutOfBounds:openair2/LAYER2/rlc_v2/tests/test.c:401
 //
 //-----------------------------------------------------------------------------
+// this file is used for testing the NR RLC implementation, this error is
+// not a problem, the programmer has to know what she does when writing
+// the tests
+arrayIndexOutOfBounds:openair2/LAYER2/nr_rlc/tests/test.c:451
+//
+//-----------------------------------------------------------------------------
 // cppcheck does not understand the different lengths of arrays
 arrayIndexOutOfBounds:openair1/SIMULATION/TOOLS/random_channel.c:705
 arrayIndexOutOfBounds:openair1/SIMULATION/TOOLS/random_channel.c:706