src/lib/libugidfw/ugidfw.c:105]: (style) Checking if unsigned variable 'len' is less than zero.

Source code is

           len = snprintf(cur, left, "uid %s",
                                    pwd->pw_name);
           if (len < 0 || len > left)

but len is unsigned and the return value from snprintf is int. 

Suggest sanity check return value before assignment into unsigned variable.

Multiple duplicates:

src/lib/libugidfw/ugidfw.c:112]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:123]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:130]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:137]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:145]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:155]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:162]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:173]: (style) Checking if unsigned variable 'len' is less than zero.
[src/lib/libugidfw/ugidfw.c:180]: (style) Checking if unsigned variable 'len' is less than zero.
...