patch 8.2.1076: Vim9: no line break allowed in :if expression

Problem:    Vim9: no line break allowed in :if expression.
Solution:   Skip linebreak.
diff --git a/src/evalvars.c b/src/evalvars.c
index 0acbd7b..1d6172a 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -804,7 +804,7 @@
 	    i = eval0(expr, &rettv, eap, &evalarg);
 	    if (eap->skip)
 		--emsg_skip;
-	    vim_free(evalarg.eval_tofree);
+	    clear_evalarg(&evalarg, eap);
 	}
 	if (eap->skip)
 	{