OsmocomBB

https://cgit.osmocom.org/osmocom-bb/commit/?id=fd8962e89144fb0af4b99199589d9f9768804640 completely broke ms-sdr audio calls, the len is 0, but not always - removing the assertion "makes it work again", as far as not crashing and hearing sound is concerned.
Audio has never really sounded great, so, it looks like we are getting broken audio frames that are now missing due to the patch/have len 0?

<0014> gapk_io.c:300 PQ 'pq_audio_sink': chain 'source/tch_fb -> format/gsm -> ecu/fr -> format/gsm -> codec/fr -> sink/alsa' prepared
<0014> gapk_io.c:476 GAPK I/O initialized for MS '1', codec 'fr'
<0001> gsm48_rr.c:4074 request suspension of data link
<0001> gsm48_rr.c:4540 suspension coplete, leaving dedicated mode
<0001> gsm48_rr.c:3001 setting indicated TA 0 (actual TA 0)
<0001> gsm48_rr.c:3012 using last SACCH timeout 32
<0001> gsm48_rr.c:837 stopping pending timer T_meas
<0001> gsm48_rr.c:2901 MEAS REP: pwr=19 TA=0 meas-invalid=1 rxlev-full=-110 rxlev-sub=-110 rxqual-full=0 rxqual-sub=0 dtx 0 ba 0 no-ncell-n 0
<0001> gsm48_rr.c:3034 establishing channel in dedicated mode
<0001> gsm48_rr.c:3045  Channel type 8, subch 0, ts 2, mode 1, audio-mode 10, cipher 1
<0001> gsm48_rr.c:4575 request resume of data link
<0001> gsm48_rr.c:3708 ASSIGNMENT COMPLETE (cause #0)
mobile: fmt_gsm.c:48: int gsm_to_canon(uint8_t *, const uint8_t *, unsigned int): Assertion `src_len == GSM_LEN' failed.
Process 2211765 stopped
* thread #1, name = 'mobile', stop reason = signal SIGABRT
    frame #0: 0x0000007ff7a753f8 libc.so.6`__pthread_kill_implementation(threadid=549621288992, signo=6, no_tid=<unavailable>) at pthread_kill.c:44:76
(lldb) bt
* thread #1, name = 'mobile', stop reason = signal SIGABRT
  * frame #0: 0x0000007ff7a753f8 libc.so.6`__pthread_kill_implementation(threadid=549621288992, signo=6, no_tid=<unavailable>) at pthread_kill.c:44:76
    frame #1: 0x0000007ff7a2b6ac libc.so.6`__GI_raise(sig=6) at raise.c:26:13
    frame #2: 0x0000007ff7a16ec0 libc.so.6`__GI_abort at abort.c:79:7
    frame #3: 0x0000007ff7a24bf8 libc.so.6`__assert_fail_base(fmt="%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion="src_len == GSM_LEN", file="fmt_gsm.c", line=48, function="int gsm_to_canon(uint8_t *, const uint8_t *, unsigned int)") at assert.c:92:3
    frame #4: 0x0000007ff7a24c6c libc.so.6`__assert_fail(assertion="src_len == GSM_LEN", file="fmt_gsm.c", line=48, function="int gsm_to_canon(uint8_t *, const uint8_t *, unsigned int)") at assert.c:101:3
    frame #5: 0x0000007ff7ba5980 libosmogapk.so.0`gsm_to_canon(dst=<unavailable>, src=<unavailable>, src_len=<unavailable>) at fmt_gsm.c:48:2
    frame #6: 0x0000007ff7ba2eac libosmogapk.so.0`osmo_gapk_pq_execute(pq=0x00000055557629c0) at procqueue.c:202:8
    frame #7: 0x00000055555afbd0 mobile`gapk_io_serve_ms(ms=0x0000005555732120) at gapk_io.c:572:3
    frame #8: 0x00000055555693bc mobile`mobile_work(ms=0x0000005555732120) at app_mobile.c:86:9
    frame #9: 0x000000555556a0e0 mobile`_mobile_app_work at app_mobile.c:428:12
    frame #10: 0x00000055555691d4 mobile`main(argc=<unavailable>, argv=<unavailable>) at main.c:340:3
    frame #11: 0x0000007ff7a17584 libc.so.6`__libc_start_call_main(main=(mobile`main at main.c:250), argc=3, argv=0x0000007fffffec98) at libc_start_call_main.h:58:16
    frame #12: 0x0000007ff7a17658 libc.so.6`__libc_start_main_impl(main=(mobile`main at main.c:250), argc=3, argv=0x0000007fffffec98, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>, stack_end=<unavailable>) at libc-start.c:360:3
    frame #13: 0x0000005555568970 mobile`_start + 48
(lldb)