platform/x86/intel/tpmi/plr: Fix output in plr_print_bits()

Smatch complains that 'str' can be used without being initialized:

    drivers/platform/x86/intel/intel_plr_tpmi.c:178 plr_print_bits()
    error: uninitialized symbol 'str'.

In this loop, we iterate over all the set bits and print the name of the
bit.  The intention is that if there is a bit which is between 0-31 we
look for the name in the first array plr_coarse_reasons[] which has 10
elements.  If the bit is in the 32-63 range we look for it in the
plr_fine_reasons[] array which has 30 elements.  If the bit is in the
invalid ranges, 10-31 or 62-63, then we should print "UNKNOWN(%d)".

The problem is that 'str' needs to be initialized at the start of each
iteration, otherwise if we can't find the string then instead of printing
"UNKNOWN(%d)", we will re-print whatever the previous bit was.

Fixes: 9e9397a4 ("platform/x86/intel/tpmi/plr: Add support for the plr mailbox")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/b0084e70-4144-445a-9b89-fb19f6b8336a@stanley.mountain


Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>