corrected leak memory in AHTMatcher.h

include/falkolib/Matching/AHTMatcher.h

@@ -138,6 +138,8 @@ namespace falkolib {
 
 		/** @brief get best matching given point and an initial guest associations list*/
 		int getBestMatching(const std::vector<T>& v1, const std::vector<T>& v2, const std::vector<std::pair<int, int> >& init, std::vector<std::pair<int, int> >& match) {
+			for (auto &cell : matchesGrid)
+		        cell.clear();
 			for (auto& asso : init) {
 				for (int it = 0; it < thetaSize; ++it) {
 					double theta = thetaRes * (it - thetaSize / 2);