isl_test.c: test_output: avoid invalid access on error

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

diff --git a/isl_test.c b/isl_test.c
index 4532afa..603622d 100644 (file)
--- a/isl_test.c
+++ b/isl_test.c
@@ -2969,7 +2969,10 @@ int test_output(isl_ctx *ctx)
        s = isl_printer_get_str(p);
        isl_printer_free(p);
        isl_pw_aff_free(pa);
-       equal = !strcmp(s, "(2 - x + 4*floord(x, 4) >= 0) ? (1) : 2");
+       if (!s)
+               equal = -1;
+       else
+               equal = !strcmp(s, "(2 - x + 4*floord(x, 4) >= 0) ? (1) : 2");
        free(s);
        if (equal < 0)
                return -1;