cachefiles: use ASSERT_FAIL()/ASSERT_WARN() to cleanup some code

Since ASSERT_FAIL() and ASSERT_WARN() have been provided, ASSERT()
may be realized through them, thus reducing code redundancy and
facilitating problem analysis.

Signed-off-by: Chunguang Xu <brookxu@tencent.com>

fs/cachefiles/internal.h

@@ -316,14 +316,7 @@ do {							\
 
 #if 1 /* defined(__KDEBUGALL) */
 
-#define ASSERT(X)							\
-do {									\
-	if (unlikely(!(X))) {						\
-		pr_err("\n");						\
-		pr_err("Assertion failed\n");		\
-		BUG();							\
-	}								\
-} while (0)
+#define ASSERT(X) ASSERT_FAIL(x)
 
 #define ASSERTCMP(X, OP, Y)						\
 do {									\