replaced hardcoded array size with sizeof() (#64)

Author: gonzolively

src/main.c

@@ -872,7 +872,7 @@ void create_sample_container(char *file_name) {
             0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x04, 0x00, 0x00, 0x00, 0x00,
             0x02, 0x00};
 
-    unsigned int wasm_binary_len = 14384;
+    int wasm_binary_len = sizeof(wasm_binary);
 
     fs_write(&f, &wasm_binary, wasm_binary_len);