Make c99, c23 compatible

Author: soutaro

ext/rbs_extension/location.c

@@ -2,7 +2,7 @@
 
 #define RBS_LOC_REQUIRED_P(loc, i) ((loc)->children->required_p & (1 << (i)))
 #define RBS_LOC_OPTIONAL_P(loc, i) (!RBS_LOC_REQUIRED_P((loc), (i)))
-#define RBS_LOC_CHILDREN_SIZE(cap) (sizeof(rbs_loc_children) + sizeof(rbs_loc_entry) * (cap))
+#define RBS_LOC_CHILDREN_SIZE(cap) (sizeof(rbs_loc_children) + sizeof(rbs_loc_entry) * ((cap) - 1))
 
 VALUE RBS_Location;
 

ext/rbs_extension/location.h

@@ -16,17 +16,19 @@ typedef struct {
 
 typedef unsigned int rbs_loc_entry_bitmap;
 
+// The flexible array always allocates, but it's okay.
+// This struct is not allocated when the `rbs_loc` doesn't have children.
 typedef struct {
   unsigned short len;
   unsigned short cap;
   rbs_loc_entry_bitmap required_p;
-  rbs_loc_entry entries[0];
+  rbs_loc_entry entries[1];
 } rbs_loc_children;
 
 typedef struct {
   VALUE buffer;
   range rg;
-  rbs_loc_children *children;
+  rbs_loc_children *children; // NULL when no children is allocated
 } rbs_loc;
 
 /**