[HIFN 04/n]: Handle ablkcipher_walk errors

[Patrick McHardy <kaber@trash.net>]

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commit 7e24c849df30a5d2b0bb89165b933ea2faa747bd
Author: Patrick McHardy <kaber@trash.net>
Date:   Wed May 7 12:43:20 2008 +0200

    [HIFN]: Handle ablkcipher_walk errors
    
    ablkcipher_walk may return a negative error value, handle this properly
    instead of treating it as a huge number of scatter-gather elements.
    
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/drivers/crypto/hifn_795x.c b/drivers/crypto/hifn_795x.c
index cce6e6f..4e89cd8 100644
--- a/drivers/crypto/hifn_795x.c
+++ b/drivers/crypto/hifn_795x.c
@@ -1602,7 +1602,10 @@ static int hifn_setup_session(struct ablkcipher_request *req)
 	idx = 0;
 
 	sg_num = ablkcipher_walk(req, &ctx->walk);