expand: Fix skipping of command substitution when trimming in evalvar

When we are trimming an unset variable in evalvar, any embedded
command substitution that should have been skipped are not.  This
can cause them to be evaluated later should there be other command
substitutions in the same input word.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/expand.c b/src/expand.c
index c565646..7a51766 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -805,6 +805,8 @@ record:
 		goto record;
 	}
 
+	varlen = 0;
+
 end:
 	if (subtype != VSNORMAL) {	/* skip to end of alternative */
 		int nesting = 1;