Minor cleanup

[a1346054]

No description provided.

[t-mat]

Hi @a1346054, thanks for your contribution.

Every change set looks good and straightforward. But I found minor issue for doc/lz4_manual.html.

https://github.com/a1346054/lz4/commit/f47bf9c72663647963ac26754236123a51904659#diff-b471b105cac7577745eb71a045a765fb1bec13ae7ae293ecba95589576a675d7R66

Since this file is automatically generated by contrib/gen_manual/gen_manual, cosmetic change for its output (doc/lz4_manual.html) doesn't resolve the issue.

If you want solve this, please fix gen_manual and commit its output.

---

I think the root cause of this cosmetic issue is print_line() outputs "blank" line which only contains spaces.

The following change may resolve the issue. But I'm not sure it satisfy your intention or not.

	void print_line(stringstream &sout, string line)
	{
+	    if (line.find_first_not_of(' ') == std::string::npos) line = "";
	    if (line.substr(0,11) == "LZ4LIB_API ") line = line.substr(11);
	    ...
	}

---

(edit) doc/lz4frame_manual.html is also generated by gen_manual.

[a1346054]

I didn't want to touch the contrib files, so I now changed that commit so that it doesn't touch those autogenerated files.