[PATCH] var: Remove unset check in varnull

Unset variables always carry two NUL characters at the end so it's
safe to call strchrnul in varnull uncondtionally and step past the
first NUL character.

Signed-off-by: Herbert Xu <[email protected]>

diff --git a/src/var.c b/src/var.c
index 6e0671a..90fc896 100644
--- a/src/var.c
+++ b/src/var.c
@@ -156,7 +156,8 @@ RESET {
 
 static char *varnull(const char *s)
 {
-	return (strchr(s, '=') ?: nullstr - 1) + 1;
+	/* Unset variables always end with two NUL chars. */
+	return strchrnul(s, '=') + 1;
 }
 
 /*
-- 
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt