[crypto] Add parentheses around len argument in blocksize assert

This fixes an issue where passing a length as a compound expression
(e.g. using `hdrlen + datalen') would trigger compiler warnings and
potentially precedence-related errors.

Signed-off-by: Marty Connor <mdc@etherboot.org>

diff --git a/src/include/gpxe/crypto.h b/src/include/gpxe/crypto.h
index 3831b79..751ca05 100644 (file)
--- a/src/include/gpxe/crypto.h
+++ b/src/include/gpxe/crypto.h
@@ -129,7 +129,7 @@ static inline void cipher_encrypt ( struct cipher_algorithm *cipher,
        cipher->encrypt ( ctx, src, dst, len );
 }
 #define cipher_encrypt( cipher, ctx, src, dst, len ) do {              \
-       assert ( ( len & ( (cipher)->blocksize - 1 ) ) == 0 );          \
+       assert ( ( (len) & ( (cipher)->blocksize - 1 ) ) == 0 );        \
        cipher_encrypt ( (cipher), (ctx), (src), (dst), (len) );        \
        } while ( 0 )
 
@@ -139,7 +139,7 @@ static inline void cipher_decrypt ( struct cipher_algorithm *cipher,
        cipher->decrypt ( ctx, src, dst, len );
 }
 #define cipher_decrypt( cipher, ctx, src, dst, len ) do {              \
-       assert ( ( len & ( (cipher)->blocksize - 1 ) ) == 0 );          \
+       assert ( ( (len) & ( (cipher)->blocksize - 1 ) ) == 0 );        \
        cipher_decrypt ( (cipher), (ctx), (src), (dst), (len) );        \
        } while ( 0 )