tools/intel_reg: Don't reuse stale decoded results for later registers

In case the ->debug_output() function skips decoding the register it
just returns, which means the caller will reuse whatever it already has
in the tmp buffer as the decoded result for this result. What it usually
has in there is the decoded result of some previous register.

Showing incorrect decoded results is no good, so let's allow
->debug_output() to actually return how many bytes it wrote, and the
caller can then skip showing the decoded results if zero bytes
were produced.

We'll make a variant of snprintf() that's safe to call without having to
check the return value for the case when it didn't have enough space to
do its work, that is, make it return 0 in case no bytes were written.

v2: Document the _DEBUGSTRING() funcion (Jani)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

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