Remove set but not used variable

[zdenop]

reported by clang.

And If I understand the code correctly: this old code (3.01) calculates gap, but never use it...

tesseract/src/ccmain/control.cpp

Lines 1687 to 1698 in 1569e50

	// Measure the mean space.
	int gap_count = 0;
	WERD *werd = word_res->word;
	C_BLOB_IT blob_it(werd->cblob_list());
	C_BLOB *prev_blob = blob_it.data();
	for (blob_it.forward(); !blob_it.at_first(); blob_it.forward()) {
	C_BLOB *blob = blob_it.data();
	int gap = blob->bounding_box().left();
	gap -= prev_blob->bounding_box().right();
	++gap_count;
	prev_blob = blob;
	}

[stweil]

I wonder whether it would be better to use some variables in (configurable) debug output. Some of them can help to get a better understanding of the code. That's why I never removed them.

[zdenop]

No problem for me - I just wanted:

• to highlight these variables as they indicate not used/unfinished/not cleaned code
• to have a clean build without warnings

[amitdo]

https://en.cppreference.com/w/cpp/language/attributes/maybe_unused