gitk: Fix typo in proc blobdiffmaybeseehere
The recent
5de460a2 (Refactor per-line part of getblobdiffline and its
support) introduced blobdiffmaybeseehere, and accidentally forgot the '$'
to access the parameter as a TCL variable. This resulted in a failing
"Back" button with the error
can't use non-numeric string as operand of "!"
while executing
"if {!$ateof} {
set nlines [expr {[winfo height $ctext]
/ [font metrics textfont -linespace]}]
if {[$ctext compare "$target_scrollpos + $nlines ..."
(procedure "maybe_scroll_ctext" line 5)
Signed-off-by: Johannes Sixt <j6t@kdbg.org>