import used execl, which had the nil added yesterday,
but i suspect it was intended to be execv all along
in one case.

Notes:
Sat Jul 23 10:05:21 EDT 2005 rsc
    right you are


Reference: /n/sources/patch/applied/import-exec
Date: Fri Jul 22 14:51:13 CES 2005
Reviewed-by: rsc

--- /sys/src/cmd/import.c	Fri Jul 22 14:48:26 2005
+++ /sys/src/cmd/import.c	Fri Jul 22 14:48:22 2005
@@ -201,7 +201,7 @@
 	alarm(0);
 
 	if(backwards && argc > 1){
-		execl(argv[1], &argv[1], nil);
+		execv(argv[1], &argv[1]);
 		sysfatal("exec: %r");
 	}
 	exits(0);