zstd: Fix definition of assert()

assert(x) should emit a warning if x is false. WARN_ON(x) emits a
warning if x is true. Thus, assert(x) should be defined as WARN_ON(!x)
rather than WARN_ON(x).

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Nick Terrell <terrelln@fb.com>

lib/zstd/common/zstd_deps.h

@@ -84,7 +84,7 @@ static uint64_t ZSTD_div64(uint64_t dividend, uint32_t divisor) {
 
 #include <linux/kernel.h>
 
-#define assert(x) WARN_ON((x))
+#define assert(x) WARN_ON(!(x))
 
 #endif /* ZSTD_DEPS_ASSERT */
 #endif /* ZSTD_DEPS_NEED_ASSERT */