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>

---
0f6b025864c8536538da5a6b2b68e73dba1a2ab8 diff --git a/crypto/Kconfig b/crypto/Kconfig
index c3166a1..b12a3ee 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.
 

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