[PATCH] adjust msgb api

[☎]

Hi.

While looking at osmocom-bb compilation warnings I've noticed that there are plenty
of those cause by signed-unsigned comparison with msgb-related functions. Attached is
a trivial patch which fixes that by changing int -> uint16_t. For the sake of
completeness I've also changed other functions to explicitly use uint16_t - this is
used for length fields in "struct msgb" anyway.

Although technically it's API change I do not expect any sane code to break. If you
still think it's potentially insecure, this could be applied during next api version
bump alongside with gprs api change.

-- 
best regards,
Max, http://fairwaves.ru
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