Merge branch 'bugfix/btdm_fix_crash_when_test_multi_connect_v3.1' into 'release/v3.1'

Component/bt: fix crash when test multi_connect(backport v3.1)

See merge request idf/esp-idf!3313
This commit is contained in:
Jiang Jiang Jian
2018-09-20 14:02:12 +08:00