Avoid overrun. Coverity ID 60.

crypto/aes/aes_cfb.c

@@ -190,7 +190,7 @@ void AES_cfbr_encrypt_block(const unsigned char *in,unsigned char *out,
 			    unsigned char *ivec,const int enc)
     {
     int n,rem,num;
-    unsigned char ovec[AES_BLOCK_SIZE*2];
+    unsigned char ovec[AES_BLOCK_SIZE*2 + 1];  /* +1 because we dererefence (but don't use) one byte off the end */
 
     if (nbits<=0 || nbits>128) return;