[buildbot] phase1: fix workdir of maketag.sh step

[LEDE Commits]

jow pushed a commit to buildbot.git, branch master:
https://git.lede-project.org/1942449281135c6304e70546f71750a317804015

commit 1942449281135c6304e70546f71750a317804015
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Sun Jan 29 17:51:33 2017 +0100

    phase1: fix workdir of maketag.sh step
    
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 phase1/master.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/phase1/master.cfg b/phase1/master.cfg
index abb5501..a8d6737 100644
--- a/phase1/master.cfg
+++ b/phase1/master.cfg
@@ -383,7 +383,7 @@ for target in targets:
 		description = "Tagging Git repository",
 		command = [home_dir+'/maketag.sh', '-i', '-k', str(gpg_keyid or ''),
 		           '-p', str(gpg_passfile or ''), '-v', WithProperties("%(tag:-)s")],
-		path = home_dir+'/source.git',
+		workdir = home_dir+'/source.git',
 		env = {'GNUPGHOME': gpg_home},
 		haltOnFailure = True,
 		doStepIf = IsTaggingRequested,