[PATCH] completion: don't leak variable from the prompt into environment

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Commit e5b8eebc (completion: fix issue with process substitution not
working on Git for Windows, 2011-10-26) introduced a new variable in
__git_ps1_show_upstream(), but didn't declare it as local to prevent
it from leaking into the environment.
---
 contrib/completion/git-completion.bash |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index b3571ab4..d18895b1 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -110,7 +110,7 @@ __git_ps1_show_upstream ()
 	local upstream=git legacy="" verbose=""
 
 	# get some config options from git-config
-	output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
+	local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
 	while read key value; do
 		case "$key" in
 		bash.showupstream)
-- 
1.7.8.rc0.107.g695cb

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