pinctrl: thunderbay: fix possible memory leak in thunderbay_build_functions()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: pinctrl: thunderbay: fix possible memory leak in thunderbay_build_functions() The thunderbay_add_functions() will free memory of thunderbay_funcs when everything is ok, but thunderbay_funcs will not be freed when thunderbay_add_functions() fails, then there will be a memory leak, so we need to add kfree() when thunderbay_add_functions() fails to fix it. In addition, doing some cleaner works, moving kfree(funcs) from thunderbay_add_functions() to thunderbay_build_functions().

References

• https://git.kernel.org/stable/c/3650943bab29d03ef147290451237713ed1942cd
• https://git.kernel.org/stable/c/aae4846e8e49044cb51d0276bec2a3fc2d5cd8da
• https://git.kernel.org/stable/c/83e1bcaf8cef26edaaf2a6098ef760f563683483