Wrong values printed in debug output (#298)

In a testing utility that checks for equality between two matrix structures, if inequality was found, the wrong data was printed to screen. This meta-bug is not expected to have had any ill effects -- the error detection mechanism itself was correct (and for everything that has been merged or released did not trigger); nonetheless, this MR fixes it.

Many thanks to Aleksa for detecting and fixing the bug!

Author: aleksamilisavljevic

tests/utils/matrix_values_check.hpp

@@ -334,7 +334,7 @@ namespace grb {
 				for( auto t = storage1.col_start[ i ]; t < storage1.col_start[ i + 1 ]; t++ ) {
 					if( storage1.row_index[ t ] != storage2.row_index[ t ] ) {
 						std::cerr << "Error: row_index[" << t << "] is different: "
-							<< storage1.row_index[ i ] << " != " << storage2.row_index[ i ]
+							<< storage1.row_index[ t ] << " != " << storage2.row_index[ t ]
 							<< std::endl;
 						return FAILED;
 					}