[master] 7ff636dca free array returned by backtrace_symbols(3)

[Poul-Henning Kamp]

commit 7ff636dca1dc3e94ce19edba4ff38d4d9267726b
Author: Guillaume Quintard <guillaume at varnish-software.com>
Date:   Wed Aug 28 12:32:43 2019 -0700

    free array returned by backtrace_symbols(3)

diff --git a/bin/varnishd/cache/cache_panic.c b/bin/varnishd/cache/cache_panic.c
index 2580b4ada..c45dfc4c0 100644
--- a/bin/varnishd/cache/cache_panic.c
+++ b/bin/varnishd/cache/cache_panic.c
@@ -646,6 +646,7 @@ pan_backtrace(struct vsb *vsb)
 			VSB_printf(vsb, "%s", p);
 		}
 		VSB_printf (vsb, "\n");
+		free(strings);
 	}
 	VSB_indent(vsb, -2);
 }