Not visible in the diff, but just a couple of line later, after the
`done' label, we close both f1 and f2 with got_gotweb_closefile() that
does the fseek, ftruncate and fclose dance.

f3 needs to be rewinded on the other hand since it's where the diff
is.

ok?

diff /home/op/w/gotacl
commit - 8a078d7f1359fdf37e7bc18d6ace3c3579b98b33
path + /home/op/w/gotacl
blob - ed987b10276ab43077d34ad182e40d494811d709
file + gotwebd/got_operations.c
--- gotwebd/got_operations.c
+++ gotwebd/got_operations.c
@@ -1230,16 +1230,6 @@ got_open_diff_for_output(FILE **fp, struct request *c)
 	if (error)
 		goto done;
 
-	if (fseek(f1, 0, SEEK_SET) == -1) {
-		error = got_ferror(f1, GOT_ERR_IO);
-		goto done;
-	}
-
-	if (fseek(f2, 0, SEEK_SET) == -1) {
-		error = got_ferror(f2, GOT_ERR_IO);
-		goto done;
-	}
-
 	if (fseek(f3, 0, SEEK_SET) == -1) {
 		error = got_ferror(f3, GOT_ERR_IO);
 		goto done;