warnings: fix shell/environ.c
This removes the "unsigned" for environment variables, since
the public header has all "char *" types.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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This removes the "unsigned" for environment variables, since
the public header has all "char *" types.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>