thunderbolt: Fix v2.0 reset to reliably wait for the reset to finishHEADmain

The `reg` value was never initialized, so the loop could potentially
abort without a single read of the register.  This was found by the
following warning from GCC:

sys/dev/thunderbolt/nhi.c: In function 'nhi_reset_v2':
sys/dev/thunderbolt/nhi.c:272:35: error: 'reg' is used uninitialized [-Werror=uninitialized]
  272 |         for (size_t i = 0; i < 10 && reg; i++) {
      |                                   ^~
sys/dev/thunderbolt/nhi.c:257:18: note: 'reg' was declared here
  257 |         uint32_t reg;
      |                  ^~~

Reported by:	GCC 15
Fixes:		efdb82413963 ("thunderbolt: Reset controllers")

0 files changed, 0 insertions, 0 deletions