tree-wide: drop !! casts to booleans

They are not needed, because anything that is non-zero is converted
to true.

C11:
> 6.3.1.2: When any scalar value is converted to _Bool, the result is 0 if the
> value compares equal to 0; otherwise, the result is 1.

https://stackoverflow.com/questions/31551888/casting-int-to-bool-in-c-c

1 files changed, 12 insertions, 0 deletions

diff --git a/coccinelle/bool-cast.cocci b/coccinelle/bool-cast.cocci
new file mode 100644
index 0000000000..051ccb9417
--- /dev/null
+++ b/coccinelle/bool-cast.cocci
@@ -0,0 +1,12 @@
+@@
+bool b;
+expression y;
+@@
+- b = !!(y);
++ b = y;
+@@
+bool b;
+expression y;
+@@
+- b = !!y;
++ b = y;