Use std::deque for assertions

Also fix a memory leak

include/link/patch.hpp

@@ -4,6 +4,7 @@
 #ifndef RGBDS_LINK_PATCH_H
 #define RGBDS_LINK_PATCH_H
 
+#include <deque>
 #include <stdint.h>
 
 #include "link/section.hpp"
@@ -11,20 +12,17 @@
 #include "linkdefs.hpp"
 
 struct Assertion {
-	struct Patch patch;
-	// enum AssertionType type; The `patch`'s field is instead re-used
+	struct Patch patch; // Also used for its `.type`
 	char *message;
 	// This would be redundant with `.section->fileSymbols`... but `section` is sometimes NULL!
 	struct Symbol **fileSymbols;
-
-	struct Assertion *next;
 };
 
 /*
  * Checks all assertions
  * @return true if assertion failed
  */
-void patch_CheckAssertions(struct Assertion *assertion);
+void patch_CheckAssertions(std::deque<struct Assertion> &assertions);
 
 /*
  * Applies all SECTIONs' patches to them