xlat lib v2: Fix sign of debug loop variable

This patch changes the sign of the loop variable used in
xlat_tables_print(). It needs to be unsigned because it is compared
against another unsigned int.

Change-Id: I2b3cee7990dd75e8ebd2701de3860ead7cad8dc8
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>

lib/xlat_tables_v2/xlat_tables_internal.c

@@ -1123,7 +1123,7 @@ void xlat_tables_print(xlat_ctx_t *ctx)
 	int used_page_tables;
 #if PLAT_XLAT_TABLES_DYNAMIC
 	used_page_tables = 0;
-	for (int i = 0; i < ctx->tables_num; ++i) {
+	for (unsigned int i = 0; i < ctx->tables_num; ++i) {
 		if (ctx->tables_mapped_regions[i] != 0)
 			++used_page_tables;
 	}