fs_mitm: Fix mismatched new[] / delete (#389)

* fs.mitm: Fix mismatched new[] / delete

Using delete instead of delete[] on a pointer given by new[] is
undefined behaviour.

For memory sources, malloc/free are used because cleaning up is tricky
when data can be either allocated with new (RomfsHeader) or new[]
(metadata).

* set.mitm: Fix mismatched new[] / delete

stratosphere/ams_mitm/source/fs_mitm/fsmitm_romfsbuild.hpp

@@ -15,6 +15,7 @@
  */
  
 #pragma once
+#include <cstdlib>
 #include <switch.h>
 #include <map>
 
@@ -120,10 +121,10 @@ struct RomFSSourceInfo {
             case RomFSDataSource::MetaData:
                 break;
             case RomFSDataSource::LooseFile:
-                delete this->loose_source_info.path;
+                delete[] this->loose_source_info.path;
                 break;
             case RomFSDataSource::Memory:
-                delete this->memory_source_info.data;
+                std::free((void*)this->memory_source_info.data);
                 break;
             default:
                 fatalSimple(0xF601);