fast-export --export-marks: fix off by one error

The export_marks() function iterated over a (potentially sparsely
populated) hashtable, but it accessed it starting from offset 1 and one
element beyond the end.

Noticed by SungHyun Nam.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-fast-export.c

@@ -379,19 +379,19 @@ static void export_marks(char *file)
 	if (!f)
 		error("Unable to open marks file %s for writing", file);
 
-	for (i = 0; i < idnums.size; ++i) {
+	for (i = 0; i < idnums.size; i++) {
-		deco++;
+		if (deco->base && deco->base->type == 1) {
-		if (deco && deco->base && deco->base->type == 1) {
 			mark = ptr_to_mark(deco->decoration);
 			fprintf(f, ":%u %s\n", mark, sha1_to_hex(deco->base->sha1));
 		}
+		deco++;
 	}
 
 	if (ferror(f) || fclose(f))
 		error("Unable to write marks file %s.", file);
 }
 
-static void import_marks(char * input_file)
+static void import_marks(char *input_file)
 {
 	char line[512];
 	FILE *f = fopen(input_file, "r");
@@ -407,7 +407,7 @@ static void import_marks(char * input_file)
 		line_end = strchr(line, '\n');
 		if (line[0] != ':' || !line_end)
 			die("corrupt mark line: %s", line);
-		*line_end = 0;
+		*line_end = '\0';
 
 		mark = strtoumax(line + 1, &mark_end, 10);
 		if (!mark || mark_end == line + 1

decorate.c

@@ -37,10 +37,7 @@ static void grow_decoration(struct decoration *n)
 {
 	int i;
 	int old_size = n->size;
-	struct object_decoration *old_hash;
+	struct object_decoration *old_hash = n->hash;
-
-	old_size = n->size;
-	old_hash = n->hash;
 
 	n->size = (old_size + 1000) * 3 / 2;
 	n->hash = xcalloc(n->size, sizeof(struct object_decoration));