patch 8.2.1080: Vim9: no line break allowed in a for loop

Problem:    Vim9: no line break allowed in a for loop.
Solution:   Skip line breaks in for command.

src/userfunc.c

@@ -3825,6 +3825,7 @@ ex_return(exarg_T *eap)
 
     if (eap->skip)
 	--emsg_skip;
+    clear_evalarg(&evalarg, eap);
 }
 
 /*