Fix build warning: Initialize variables before logging

[Spacefish]

Initialize two variables before accessing them in a goto block for logging.

Fixes build warnings like these:

In file included from /usr/include/stdio.h:970,
                 from /usr/include/malloc.h:25,
                 from /home/spacy/src/libsurvive/redist/linmath.h:7,
                 from /home/spacy/src/libsurvive/include/libsurvive/survive_types.h:5,
                 from /home/spacy/src/libsurvive/include/libsurvive/poser.h:4,
                 from /home/spacy/src/libsurvive/include/libsurvive/survive.h:5,
                 from /home/spacy/src/libsurvive/src/survive_sensor_activations.c:4:
In function ‘snprintf’,
    inlined from ‘SurviveSensorActivations_check_outlier’ at /home/spacy/src/libsurvive/src/survive_sensor_activations.c:183:3:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:68:10: warning: ‘measured_dev’ may be used uninitialized [-Wmaybe-uninitialized]
   68 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   69 |                                    __glibc_objsize (__s), __fmt,
      |                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   70 |                                    __va_arg_pack ());
      |                                    ~~~~~~~~~~~~~~~~~
/home/spacy/src/libsurvive/src/survive_sensor_activations.c: In function ‘SurviveSensorActivations_check_outlier’:
/home/spacy/src/libsurvive/src/survive_sensor_activations.c:146:13: note: ‘measured_dev’ was declared here
  146 |         FLT measured_dev = self->angles_center_dev[lh][axis];
      |             ^~~~~~~~~~~~
In function ‘snprintf’,
    inlined from ‘SurviveSensorActivations_check_outlier’ at /home/spacy/src/libsurvive/src/survive_sensor_activations.c:183:3:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:68:10: warning: ‘cnt’ may be used uninitialized [-Wmaybe-uninitialized]
   68 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   69 |                                    __glibc_objsize (__s), __fmt,
      |                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   70 |                                    __va_arg_pack ());
      |                                    ~~~~~~~~~~~~~~~~~
/home/spacy/src/libsurvive/src/survive_sensor_activations.c: In function ‘SurviveSensorActivations_check_outlier’:
/home/spacy/src/libsurvive/src/survive_sensor_activations.c:148:13: note: ‘cnt’ was declared here
  148 |         int cnt = self->angles_center_cnt[lh][axis];
      |             ^~~

[bl4ckb0ne]

LGTM, thanks!