nimble/sm: Fix obvious array size mismatch
nimble/sm: Fix obvious array size mismatch

X-Original-Commit: 838b53a5c4712269edf3b747992fb8befa38412a

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble