[$] Some __nonstring__ turbulence

New compiler releases often bring with them new warnings; those warningsare usually welcome, since they help developers find problems before theyturn into nasty bugs. Adapting to new warnings can also create disruptionin the development process, though, especially when an important developerupgrades to a new compiler at an unfortunate time. This is just thescenario that played out with the 6.15-rc3kernel release and the implementation of-Wunterminated-string-initialization in GCC15.