[CRYPTO] null: Add missing Kconfig dependency on BLKCIPHER

This patch fixes the following build error caused by commit 
3631c650c495d61b1dabf32eb26b46873636e918:

<--  snip  -->

...
  LD      .tmp_vmlinux1
crypto/built-in.o: In function `skcipher_null_crypt':
crypto_null.c:(.text+0x3d14): undefined reference to `blkcipher_walk_virt'
crypto_null.c:(.text+0x3d14): relocation truncated to fit: R_MIPS_26 against `blkcipher_walk_virt'
crypto/built-in.o: In function `$L32':
crypto_null.c:(.text+0x3d54): undefined reference to `blkcipher_walk_done'
crypto_null.c:(.text+0x3d54): relocation truncated to fit: R_MIPS_26 against `blkcipher_walk_done'
crypto/built-in.o:(.data+0x2e8): undefined reference to `crypto_blkcipher_type'
make[1]: *** [.tmp_vmlinux1] Error 1

<--  snip  -->

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 1 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index d0287ce56daf..898acc5c1967 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -74,6 +74,7 @@ config CRYPTO_XCBC
 config CRYPTO_NULL
         tristate "Null algorithms"
         select CRYPTO_ALGAPI
+        select CRYPTO_BLKCIPHER
         help
           These are 'Null' algorithms, used by IPsec, which do nothing.