Don't let trailing empty lines overwrite the result of the last command with 0.

This affects the built-ins eval, fc, and trap and also the string passed to sh
with the -c option.

Submitted by:	Jilles Tjoelker

1 files changed, 2 insertions, 1 deletions

diff --git a/bin/sh/eval.c b/bin/sh/eval.c
index f6b702b3d2b0..26e21489440f 100644
--- a/bin/sh/eval.c
+++ b/bin/sh/eval.c
@@ -166,7 +166,8 @@ evalstring(char *s)
 	setstackmark(&smark);
 	setinputstring(s, 1);
 	while ((n = parsecmd(0)) != NEOF) {
-		evaltree(n, 0);
+		if (n != NULL)
+			evaltree(n, 0);
 		popstackmark(&smark);
 	}
 	popfile();