MDEV-9977: Crash when accessing large (>4G) InnoDB table on

MariaDB 10.1.x 32-bit binaries.

Problem was the fact that tablespace size was incorrectly
rounded to next extent size (1M).

storage/innobase/fil/fil0fil.cc

@@ -737,11 +737,9 @@ fil_node_open_file(
 			}
 		}
 
-		if (size_bytes >= FSP_EXTENT_SIZE * UNIV_PAGE_SIZE) {
+		if (size_bytes >= (1024*1024)) {
 			/* Truncate the size to whole extent size. */
-			size_bytes = ut_2pow_round(size_bytes,
-						   FSP_EXTENT_SIZE *
-						   UNIV_PAGE_SIZE);
+			size_bytes = ut_2pow_round(size_bytes, (1024*1024));
 		}
 
 		if (!fsp_flags_is_compressed(flags)) {

storage/xtradb/fil/fil0fil.cc

@@ -739,11 +739,9 @@ fil_node_open_file(
 			}
 		}
 
-		if (size_bytes >= FSP_EXTENT_SIZE * UNIV_PAGE_SIZE) {
+		if (size_bytes >= (1024*1024)) {
 			/* Truncate the size to whole extent size. */
-			size_bytes = ut_2pow_round(size_bytes,
-						   FSP_EXTENT_SIZE *
-						   UNIV_PAGE_SIZE);
+			size_bytes = ut_2pow_round(size_bytes, (1024*1024));
 		}
 
 		if (!fsp_flags_is_compressed(flags)) {
@@ -5683,7 +5681,7 @@ fil_space_get_node(
 			/* Found! */
 			break;
 		} else {
-			*block_offset -= node->size;
+			(*block_offset) -= node->size;
 			node = UT_LIST_GET_NEXT(chain, node);
 		}
 	}