get_expanded_map(): avoid memory leak

diff --git a/merge-recursive.c b/merge-recursive.c
index 40eb840a52acce0d21a17ce5a898e93f164aef97..dbb7104c043b14f2a43d67e1ca87ce88f4a55408 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2069,8 +2069,8 @@ int parse_merge_opt(struct merge_options *o, const char *s)
                o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
        else if (!strcmp(s, "histogram"))
                o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
-       else if (!strcmp(s, "diff-algorithm=")) {
-               long value = parse_algorithm_value(s+15);
+       else if (!prefixcmp(s, "diff-algorithm=")) {
+               long value = parse_algorithm_value(s + strlen("diff-algorithm="));
                if (value < 0)
                        return -1;
                /* clear out previous settings */