tree 88f296e22010fd692f9f1730791b3c159a1c5657
parent f624546ed1336ef2c092a254fddea6b904a9e274
author Neels Hofmeyr <neels@hofmeyr.de> 1507344301 +0200
committer Neels Hofmeyr <nhofmeyr@sysmocom.de> 1507646290 +0000

gsm: make osmo_imsi_str_valid() NULL-safe

No callers that would pass NULL exist, but let's check against NULL from the
start.

Fixup for recent change I1e94f5b0717b947d2a7a7d36bacdf04a75cb3522.

Change-Id: I111fbf29228929f2cd6ffa06bcb1f69da223224e