Use size_t in some DSP code code

Source/Core/Common/Hash.cpp

@@ -95,7 +95,7 @@ u32 HashAdler32(const u8* data, size_t len)
 
 // Stupid hash - but can't go back now :)
 // Don't use for new things. At least it's reasonably fast.
-u32 HashEctor(const u8* ptr, int length)
+u32 HashEctor(const u8* ptr, size_t length)
 {
   u32 crc = 0;