style: Add void to function without arguments

After run `make CC=clang` we found the following problems:

    error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ast.h b/src/ast.h
index 70d6100..e25f1bb 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -110,7 +110,7 @@ typedef struct ast_node_t
 } ast_node_t;
 
 ast_node_t *
-ast_node_new();
+ast_node_new(void);
 void
 ast_node_destroy(ast_node_t *node);