patchfix git-gui crash due to uninitialized variable

> Recently, a clone initiated via git gui on Windows crashed on me due to
> an "unknown variable cdone". It turns out that there is a code path
> where this variable is used uninitialized.
>
> Signed-off-by: Clemens Buchacher <drizzd@aon.at>
> ---

> Looking at the output of display(), it's not clear to me now the
> function below could ever be called with total=0. But I can't delve into
> it more deeply right now, and this seems like an obvious fix.
>
>  git-gui/lib/status_bar.tcl |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/git-gui/lib/status_bar.tcl b/git-gui/lib/status_bar.tcl
> index 95cb449..02111a1 100644
> --- a/git-gui/lib/status_bar.tcl
> +++ b/git-gui/lib/status_bar.tcl
> @@ -77,6 +77,7 @@ method start {msg uds} {
>  
>  method update {have total} {
>  	set pdone 0
> +	set cdone 0
>  	if {$total > 0} {
>  		set pdone [expr {100 * $have / $total}]
>  		set cdone [expr {[winfo width $w_c] * $have / $total}]

>Recently, a clone initiated via git gui on Windows crashed on me due to
>an "unknown variable cdone". It turns out that there is a code path
>where this variable is used uninitialized.
>
>Signed-off-by: Clemens Buchacher <drizzd@aon.at>
>---
>
>Looking at the output of display(), it's not clear to me now the
>function below could ever be called with total=0. But I can't delve into
>it more deeply right now, and this seems like an obvious fix.
>
> git-gui/lib/status_bar.tcl |    1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
>diff --git a/git-gui/lib/status_bar.tcl b/git-gui/lib/status_bar.tcl
>index 95cb449..02111a1 100644
>--- a/git-gui/lib/status_bar.tcl
>+++ b/git-gui/lib/status_bar.tcl
>@@ -77,6 +77,7 @@ method start {msg uds} {
> 
> method update {have total} {
> 	set pdone 0
>+	set cdone 0
> 	if {$total > 0} {
> 		set pdone [expr {100 * $have / $total}]
> 		set cdone [expr {[winfo width $w_c] * $have / $total}]