git-gui: Remove space from the end of aspell's reply before processing

When git gui processes a reply from aspell it explicitly ignores an empty
line. The Windows version of aspell, however, terminates lines with CRLF,
but TCL's 'gets' does not remove CR, hence, a "visibly" empty line was not
actually recognized as empty. With this change we explicitly trim off
whitespace before the line is further processed.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

lib/spellcheck.tcl

@@ -314,6 +314,7 @@ method _run {} {
 method _read {} {
 	while {[gets $s_fd line] >= 0} {
 		set lineno [lindex $s_pending 0 0]
+		set line [string trim $line]
 
 		if {$s_clear} {
 			$w_text tag remove misspelled "$lineno.0" "$lineno.end"