[Bug tree-optimization/78696] [7 Regression] -fprintf-return-value misoptimizes %.Ng where N is greater than 10

[jgreenhalgh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78696

--- Comment #7 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
That fixes my miscompilation, and the miscompilation of the library I reduced
the testcase from. Thanks.