btrfs: add the missing error handling inside get_canonical_dev_path

In the Linux kernel, the following vulnerability has been resolved: btrfs: add the missing error handling inside get_canonical_dev_path Inside function get_canonical_dev_path(), we call d_path() to get the final device path. But d_path() can return error, and in that case the next strscpy() call will trigger an invalid memory access. Add back the missing error handling for d_path().

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Linux kernel 安全漏洞

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于get_canonical_dev_path函数中对d_path的返回值未进行错误处理，导致在d_path返回错误时，后续的strscpy调用可能访问无效内存，引发系统崩溃。

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