Philip Withnall 55f9c6d2f4 gatomic: Add various casts to use of g_atomic_*()s to fix warnings
When compiling GLib with `-Wsign-conversion`, we get various warnings
about the atomic calls. A lot of these were fixed by
3ad375a629c91a27d0165a31f0ed298fd553de0a, but some remain. Fix them by
adding appropriate casts at the call sites.

Note that `g_atomic_int_{and,or,xor}()` actually all operate on `guint`s
rather than `gint`s (which is what the rest of the `g_atomic_int_*()`
functions operate on). I can’t find any written reasoning for this, but
assume that it’s because signedness is irrelevant when you’re using an
integer as a bit field. It’s unfortunate that they’re named a
`g_atomic_int_*()` rather than `g_atomic_uint_*()` functions.

Tested by compiling GLib as:
```
CFLAGS=-Wsign-conversion jhbuild make -ac |& grep atomic
```

I’m not going to add `-Wsign-conversion` to the set of default warnings
for building GLib, because it mostly produces false positives throughout
the rest of GLib.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Fixes: #1565
2019-09-21 10:48:23 +02:00
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