syscall: fix StartProcess in Plan 9

This makes os_test.TestStartProcess test from os package pass.

R=paulzhol, r2, r
CC=golang-dev
https://golang.org/cl/4385052

diff --git a/src/pkg/syscall/exec_plan9.go b/src/pkg/syscall/exec_plan9.go
index 94ec395d6d35b5cc0069cb571f1f8586101051ef..962b39b780f6de95bc2b505d701df014a079ef7c 100644 (file)
--- a/src/pkg/syscall/exec_plan9.go
+++ b/src/pkg/syscall/exec_plan9.go
@@ -363,7 +363,7 @@ func forkExec(argv0 string, argv []string, attr *ProcAttr) (pid int, err Error)
        p[1] = -1
 
        // Convert args to C form.
-       argv0p := StringBytePtr(argv[0])
+       argv0p := StringBytePtr(argv0)
        argvp := StringArrayPtr(argv)
 
        var chroot *byte