midi.c:79: array index used before sanity check ?

[dcb314]

midi.c:79:36: warning: loop exit may only be reached after undefined behavior [-Waggressive-loop-optimizations]

    while ((ccmatrix[cc][j] >= 0) && (j < 16)) {

Possible duplicates:
midi.c:656:41: warning: loop exit may only be reached after undefined behavior [-Waggressive-loop-optimizations]
gtkui.c:402:36: warning: loop exit may only be reached after undefined behavior [-Waggressive-loop-optimizations]
gtkui.c:391:36: warning: loop exit may only be reached after undefined behavior [-Waggressive-loop-optimizations]