[klibc] fseek: remove redundant clearing of obytes

We have already called __fflush() and gotten success, so obytes must
be zero.  That is also why we don't need to adjust the where argument
for obytes in the SEEK_CUR case.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/usr/klibc/stdio/fseek.c b/usr/klibc/stdio/fseek.c
index adfcbeb..fe6aeab 100644
--- a/usr/klibc/stdio/fseek.c
+++ b/usr/klibc/stdio/fseek.c
@@ -20,7 +20,6 @@
 	if (__likely(rv != (off_t)-1)) {
 		f->pub._IO_eof = false;
 		f->ibytes = 0;
-		f->obytes = 0;
 		return 0;
 	} else {
 		f->pub._IO_error = true;