Logger-related crash when probing USRP B200mini

[ncorgan]

Given that the crash is in a UHD class, it's possible the issue is there, but this doesn't happen with uhd_usrp_probe, so something different is happening along the way.

ncorgan@lagann:~$ gdb --arg SoapySDRUtil --probe=driver=uhd
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Reading symbols from SoapySDRUtil...
(No debugging symbols found in SoapySDRUtil)
(gdb) run
Starting program: /usr/local/bin/SoapySDRUtil --probe=driver=uhd
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
######################################################
##     Soapy SDR -- the SDR abstraction library     ##
######################################################

Probe device driver=uhd

(normal probe output here)

Thread 1 "SoapySDRUtil" received signal SIGSEGV, Segmentation fault.
0x00007fffed6b2a40 in ?? ()
(gdb) bt
#0  0x00007fffed6b2a40 in ?? ()
#1  0x00007ffff758ecb9 in log_resource::~log_resource() () from /usr/local/lib/libuhd.so.4.1.0
#2  0x00007ffff7b538d7 in __run_exit_handlers (status=0, listp=0x7ffff7cf9718 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:108
#3  0x00007ffff7b53a90 in __GI_exit (status=<optimized out>) at exit.c:139
#4  0x00007ffff7b310ba in __libc_start_main (main=0x55555555a020 <main>, argc=2, argv=0x7fffffffe048, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe038)
    at ../csu/libc-start.c:342
#5  0x000055555555c11e in _start ()