tig: add segfault patch

Signed-off-by: Nathan Owens <ndowens04@gmail.com>

srcpkgs/tig/patches/fix-segfault.patch

@@ -0,0 +1,29 @@
+From 6202c6032f17438a2facb23f02e330b9d0566d9d Mon Sep 17 00:00:00 2001
+From: Thomas Koutcher <thomas.koutcher@online.fr>
+Date: Sun, 24 Nov 2019 13:06:08 +0100
+Subject: [PATCH] Fix segmentation fault
+
+As reported by Maxim Zhukov, the commit 9ca7710 ("Fix memory leak in
+main view (#931)", 01-06-2019) causes a SIGSEGV when holding the key
+'Stage/Unstage current line' in stage view.
+
+Add a check to avoid null pointer dereference.
+
+Fixes #971
+---
+ src/graph-v2.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/graph-v2.c b/src/graph-v2.c
+index 46504a85..69ac1587 100644
+--- src/graph-v2.c
++++ src/graph-v2.c
+@@ -257,6 +257,7 @@ done_graph(struct graph *graph_ref)
+ {
+ 	struct graph_v2 *graph = graph_ref->private;
+
+-	htab_delete(graph->colors.id_map);
++	if (graph->colors.id_map)
++		htab_delete(graph->colors.id_map);
+
+ 	free(graph);

srcpkgs/tig/template

@@ -1,7 +1,7 @@
 # Template file for 'tig'
 pkgname=tig
 version=2.5.0
-revision=1
+revision=2
 wrksrc="${pkgname}-${pkgname}-${version}"
 build_style=gnu-configure
 make_install_args="install-doc-man"