[PATCH] gitk: Fix Tcl error when merge has interesting diffs.

From: Mark Wooding <redacted>

If a merge commit with nontrivial diffs is selected, gitk reports a Tcl
error:

wrong # args: should be "getmergediffline mdf id np"
    while executing
"getmergediffline file7 9fdb62af92c741addbea15545f214a6e89460865"

Change 79b2c75e... introduced the `np' argument to getmergediffline, but
failed to pass it when the function detaches and reattaches to the file
to make way for an update.

Signed-off-by: Mark Wooding <redacted>
---

 gitk |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/gitk b/gitk
index 26fa79a..3b92820 100755
--- a/gitk
+++ b/gitk

@@ -2700,7 +2700,7 @@ proc getmergediffline {mdf id np} {
 	incr nextupdate 100
 	fileevent $mdf readable {}
 	update
-	fileevent $mdf readable [list getmergediffline $mdf $id]
+	fileevent $mdf readable [list getmergediffline $mdf $id $np]
     }
 }