nimble/l2cap: Remove not needed checks
nimble/l2cap: Remove not needed checks

Minor change removing not needed check for return code.

X-Original-Commit: e9bb23e6176a55bd4897f6b8bd2213c87a04f0d6

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