gitview: Fix DeprecationWarning

DeprecationWarning: integer argument expected, got float

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

contrib/gitview/gitview

@@ -154,7 +154,7 @@ class CellRendererGraph(gtk.GenericCellRenderer):
 
 		cols = self.node[0]
 		for start, end, colour in self.in_lines + self.out_lines:
-			cols = max(cols, start, end)
+			cols = int(max(cols, start, end))
 
 		(column, colour, names) = self.node
 		names_len = 0