prog: don't pad data in exec encoding

With leb128 ints it does not make any sense.
Reduces exec sizes a bit more:

- exec sizes: 10%:597 50%:1438 90%:7145
+ exec sizes: 10%:584 50%:1423 90%:7076

1 files changed, 2 insertions, 3 deletions

diff --git a/prog/decodeexec.go b/prog/decodeexec.go
index 4574ef845..bd92854e6 100644
--- a/prog/decodeexec.go
+++ b/prog/decodeexec.go
@@ -232,15 +232,14 @@ func (dec *execDecoder) read() uint64 {
 }
 
 func (dec *execDecoder) readBlob(size uint64) []byte {
-	padded := (size + 7) / 8 * 8
-	if uint64(len(dec.data)) < padded {
+	if uint64(len(dec.data)) < size {
 		dec.setErr(fmt.Errorf("exec program overflow"))
 	}
 	if dec.err != nil {
 		return nil
 	}
 	data := dec.data[:size]
-	dec.data = dec.data[padded:]
+	dec.data = dec.data[size:]
 	return data
 }