lib/digsig: remove unnecessary memset

kzalloc() has already been initialized to full 0 space, there is no need
to use memset() to initialize again.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Liao Yuanhong <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Liao Yuanhong

lib/digsig.c

@@ -159,7 +159,6 @@ static int digsig_verify_rsa(struct key *key,
 
 	len = mlen;
 	head = len - l;
-	memset(out1, 0, head);
 	memcpy(out1 + head, p, l);
 
 	kfree(p);