patch 8.2.0788: memory leak in libvterm

Problem:    Memory leak in libvterm.
Solution:   free tmpbuffer.
diff --git a/src/libvterm/src/vterm.c b/src/libvterm/src/vterm.c
index 7b06c04..991286e 100644
--- a/src/libvterm/src/vterm.c
+++ b/src/libvterm/src/vterm.c
@@ -79,6 +79,13 @@
 
   vt->tmpbuffer_len = 64;
   vt->tmpbuffer = vterm_allocator_malloc(vt, vt->tmpbuffer_len);
+  if (vt->tmpbuffer == NULL)
+  {
+    vterm_allocator_free(vt, vt->parser.strbuffer);
+    vterm_allocator_free(vt, vt);
+    vterm_allocator_free(vt, vt->outbuffer);
+    return NULL;
+  }
 
   return vt;
 }
@@ -93,6 +100,7 @@
 
   vterm_allocator_free(vt, vt->parser.strbuffer);
   vterm_allocator_free(vt, vt->outbuffer);
+  vterm_allocator_free(vt, vt->tmpbuffer);
 
   vterm_allocator_free(vt, vt);
 }
diff --git a/src/version.c b/src/version.c
index abdb68a..4dcae55 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    788,
+/**/
     787,
 /**/
     786,