htp_request.c, htp_response.c: Fix use of uninitialized memory.
htp_utf8_decoder.c: Remove 'inline' keyword for two functions that have external linkage but use statics.

An inline function must have access to any symbols its definition uses.  In this case, it used symbols that did not have external linkage.  But the functions did have external linkage.  So any usage of them outside this file could not possibly be inlined as they would not have access to the symbols they needed.
htp_transaction.c: Fix memory leak introduced in 6a82cbced8a3d76120ffb1f26ba9c38235a37ff9.
Do not continue with the loop after seeing an error.