[PATCH] stdlib: avoid canonicalize_file_name contradiction

[Jim Meyering]

I expect to push something like the attached tomorrow:

stdlib: avoid canonicalize_file_name contradiction
* lib/stdlib.in.h (canonicalize_file_name): Remove the nonnull
attribute from its declaration. tests/test-canonicalize-lgpl.c
passes null_ptr () to it, which (via this contradiction) would
provoke a segfault from GCC 10. See a small reproducer and
discussion in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93156

canonicalize_file_name-nonnull-vs-gcc10-segfault.diff
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