firmware_class: Add null check in fw_get_filesystem_firmware

Add null check for the return value of kmem_cache_alloc before
using it.

CRs-Fixed: 836643
Change-Id: If0d8055b84fb9f9c372a68acc2a53f39035fffef
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>

drivers/base/firmware_class.c

@@ -362,6 +362,8 @@ static bool fw_get_filesystem_firmware(struct device *device,
 	int i;
 	bool success = false;
 	char *path = __getname();
+	if (!path)
+		return false;
 
 	for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
 		struct file *file;