firmware_loader: Fix a NULL vs IS_ERR() check

The crypto_alloc_shash() function doesn't return NULL, it returns
error pointers.  Update the check accordingly.

Fixes: 02fe26f ("firmware_loader: Add debug message with checksum for FW file")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Cezary Rojewski <[email protected]>
Acked-by: Luis Chamberlain <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Dan Carpenter

drivers/base/firmware_loader/main.c

@@ -812,7 +812,7 @@ static void fw_log_firmware_info(const struct firmware *fw, const char *name, st
 	char *outbuf;
 
 	alg = crypto_alloc_shash("sha256", 0, 0);
-	if (!alg)
+	if (IS_ERR(alg))
 		return;
 
 	sha256buf = kmalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);