lib: dont null check bitfield pointer before free

[qlyoung]

Signed-off-by: Quentin Young qlyoung@cumulusnetworks.com

[NetDEF-CI]

Continuous Integration Result: SUCCESSFUL

Congratulations, this patch passed basic tests

Tested-by: NetDEF / OpenSourceRouting.org CI System

CI System Testrun URL: https://ci1.netdef.org/browse/FRR-FRRPULLREQ-11939/

This is a comment from an automated CI system.
For questions and feedback in regards to this CI system, please feel free to email
Martin Winter - mwinter (at) opensourcerouting.org.

Warnings Generated during build:

Debian 10 amd64 build: Successful with additional warnings

Debian Package lintian failed for Debian 10 amd64 build:
(see full package build log at https://ci1.netdef.org/browse/FRR-FRRPULLREQ-11939/artifact/DEB10BUILD/ErrorLog/log_lintian.txt)

W: frr source: pkg-js-tools-test-is-missing
W: frr source: newer-standards-version 4.4.1 (current is 4.3.0)
W: frr source: pkg-js-tools-test-is-missing
W: frr source: newer-standards-version 4.4.1 (current is 4.3.0)
W: frr-snmp: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200418-01-g1ac10b15b-0 (missing) -> 7.4-dev-20200418-01-g1ac10b15b-0~deb10u1
W: frr-doc: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200418-01-g1ac10b15b-0 (missing) -> 7.4-dev-20200418-01-g1ac10b15b-0~deb10u1
W: frr-rpki-rtrlib: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200418-01-g1ac10b15b-0 (missing) -> 7.4-dev-20200418-01-g1ac10b15b-0~deb10u1
W: frr: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200418-01-g1ac10b15b-0 (missing) -> 7.4-dev-20200418-01-g1ac10b15b-0~deb10u1
W: frr-pythontools: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200418-01-g1ac10b15b-0 (missing) -> 7.4-dev-20200418-01-g1ac10b15b-0~deb10u1

[LabN-CI]

💚 Basic BGPD CI results: SUCCESS, 0 tests failed

Results table

_	_
Result	SUCCESS git merge/6257 1ac10b1
Date	04/17/2020
Start	21:52:46
Finish	22:18:45
Run-Time	25:59
Total	1815
Pass	1815
Fail	0
Valgrind-Errors	0
Valgrind-Loss	0
Details	vncregress-2020-04-17-21:52:46.txt
Log	autoscript-2020-04-17-21:53:44.log.bz2
Memory	498 477 429

For details, please contact louberger