Fix typo in blast.c.
diff --git a/contrib/blast/blast.c b/contrib/blast/blast.c
index 52b59da..e6e6590 100644
--- a/contrib/blast/blast.c
+++ b/contrib/blast/blast.c
@@ -260,7 +260,7 @@
* next, 0 for literals, 1 for length/distance.
*
* - If literals are uncoded, then the next eight bits are the literal, in the
- * normal bit order in th stream, i.e. no bit-reversal is needed. Similarly,
+ * normal bit order in the stream, i.e. no bit-reversal is needed. Similarly,
* no bit reversal is needed for either the length extra bits or the distance
* extra bits.
*
