gestures: Fix another zero-sized array error

Fix the last instance of dynamic sized array with zero
allocation size with tot llvm.

BUG=b:222583048
TEST=FEATURES=test USE=ubsan emerge gestures

Change-Id: I5081eb5bcbd87c3507ddcc235932192d8085a9d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/gestures/+/3514020
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Auto-Submit: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
1 file changed