[Toybox] [PATCH 1/4] sh: fix bug in parameter substitution (with shortest path removal)

[Alexander Holler]

Avoid a core dump on the following snippet:
  V="a.b"; V=${V%.*}
---
 toys/pending/sh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/toys/pending/sh.c b/toys/pending/sh.c
index 529cc5c0..298bfbc0 100644
--- a/toys/pending/sh.c
+++ b/toys/pending/sh.c
@@ -2122,7 +2122,7 @@ barf:
             }
 
             if (yy != -1) {
-              if (*delete && (*delete)->arg==ifs) ifs[yy] = 0;
+              if (delete && *delete && (*delete)->arg==ifs) ifs[yy] = 0;
               else push_arg(delete, ifs = xstrndup(ifs, yy));
             }
           }
-- 
2.25.1