Remove a few dead stores
diff --git a/library/ctr_drbg.c b/library/ctr_drbg.c
index 53b8b54..c2f78a4 100644
--- a/library/ctr_drbg.c
+++ b/library/ctr_drbg.c
@@ -105,7 +105,7 @@
     unsigned char tmp[CTR_DRBG_SEEDLEN];
     unsigned char key[CTR_DRBG_KEYSIZE];
     unsigned char chain[CTR_DRBG_BLOCKSIZE];
-    unsigned char *p = buf, *iv;
+    unsigned char *p, *iv;
     aes_context aes_ctx;
 
     int i, j;