builtin-apply: fix typo leading to stack corruption

This typo led to stack corruption for lines with whitespace fixes
and length > 1024.
Signed-off-by: NImre Deak <imre.deak@gmail.com>
Looks-good-by: NJunio C Hamano <gitster@pobox.com>
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

builtin-apply.c

@@ -1697,7 +1697,7 @@ static int match_fragment(struct image *img,
 		fixlen = ws_fix_copy(buf, orig, oldlen, ws_rule, NULL);
 
 		/* Try fixing the line in the target */
-		if (sizeof(tgtfixbuf) < tgtlen)
+		if (sizeof(tgtfixbuf) > tgtlen)
 			tgtfix = tgtfixbuf;
 		else
 			tgtfix = xmalloc(tgtlen);