Fix line information written by heaptrack_interpret.
Fix line information written by heaptrack_interpret.

The line numbers where written in decimal format, but heaptrack_print
expects hexadecimal numbers when reading. This lead to completely
wrong line numbers in the end.

stormspirit/heaptrack,stormspirit/heaptrack,muojp/heaptrack,muojp/heaptrack,muojp/heaptrack,stormspirit/heaptrack,muojp/heaptrack,muojp/heaptrack