Use kasprintf() to simplify ecryptfs_crypto_api_algify_cipher_name().

Use const char * for the read-only cipher name and chaining modifier
while at it.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 fs/ecryptfs/crypto.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 5ef67b2674ee..74b02b55e3f6 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -49,25 +49,15 @@ void ecryptfs_from_hex(char *dst, char *src, int dst_size)
 }
 
 static int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
-						  char *cipher_name,
-						  char *chaining_modifier)
+						  const char *cipher_name,
+						  const char *chaining_modifier)
 {
-	int cipher_name_len = strlen(cipher_name);
-	int chaining_modifier_len = strlen(chaining_modifier);
-	int algified_name_len;
-	int rc;
+	(*algified_name) = kasprintf(GFP_KERNEL, "%s(%s)", chaining_modifier,
+				     cipher_name);
+	if (!(*algified_name))
+		return -ENOMEM;
 
-	algified_name_len = (chaining_modifier_len + cipher_name_len + 3);
-	(*algified_name) = kmalloc(algified_name_len, GFP_KERNEL);
-	if (!(*algified_name)) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	snprintf((*algified_name), algified_name_len, "%s(%s)",
-		 chaining_modifier, cipher_name);
-	rc = 0;
-out:
-	return rc;
+	return 0;
 }
 
 /**