crypto: tcrypt - Remove the static variable initialisations to NULL

Initialise global and static variable to NULL is always unnecessary.
Remove the unnecessary initialisations.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: Jason Wang

crypto/tcrypt.c

@@ -58,7 +58,7 @@
  */
 static unsigned int sec;
 
-static char *alg = NULL;
+static char *alg;
 static u32 type;
 static u32 mask;
 static int mode;