fix warnings from GCC and Clang

test/config.ninja

@@ -1,6 +1,6 @@
 cc      = cc
 macros  = -D NDEBUG
-cflags  = -std=c99 -Wall -Wextra -Wpedantic -g $macros -O2
+cflags  = -std=c99 -Wno-missing-braces -Wall -Wextra -Wpedantic -g $macros -O2
 ldflags =
 ldlibs  =
 

test/test.c

@@ -95,9 +95,7 @@ int main(int argc, char **argv)
             .arg.bounds.inf = 1,
         },
         {
-            {
-                0,
-            },
+            0,
         },
     };