fixed error from #902

gef.py

@@ -1298,7 +1298,7 @@ def malloc_state_t() -> Type[ctypes.Structure]:
             # https://elixir.bootlin.com/glibc/glibc-2.23/source/malloc/malloc.c#L1719
             fields += [
                 ("attached_threads", pointer)
-            ]            
+            ]
         fields += [
             ("system_mem", pointer),
             ("max_system_mem", pointer),
@@ -1586,7 +1586,7 @@ def get_next_chunk(self, allow_unaligned: bool = False) -> "GlibcChunk":
 
     def get_next_chunk_addr(self) -> int:
         return self.data_address + self.size
-    
+
     def has_p_bit(self) -> bool:
         return bool(self.flags & GlibcChunk.ChunkFlags.PREV_INUSE)
 
@@ -1683,7 +1683,7 @@ def reveal_ptr(self, pointer: int) -> int:
         return gef.memory.read_integer(pointer) ^ (pointer >> 12)
 
 class GlibcTcacheChunk(GlibcFastChunk):
-    
+
     pass
 
 
@@ -6797,13 +6797,11 @@ def get_shellcode(self, sid: int) -> None:
             return
 
         ok("Downloaded, written to disk...")
-        tempdir = gef.config["gef.tempdir"]
-        fd, fname = tempfile.mkstemp(suffix=".txt", prefix="sc-", text=True, dir=tempdir)
-        shellcode = res.split("<pre>")[1].split("</pre>")[0]
-        shellcode = b"\n".join(shellcode).replace(b"&quot;", b'"')
-        os.write(fd, shellcode)
-        os.close(fd)
-        ok(f"Shellcode written to '{fname}'")
+        with tempfile.NamedTemporaryFile(prefix="sc-", suffix=".txt", mode='w+b', delete=False, dir=gef.config["gef.tempdir"]) as fd:
+            shellcode = res.split(b"<pre>")[1].split(b"</pre>")[0]
+            shellcode = shellcode.replace(b"&quot;", b'"')
+            fd.write(shellcode)
+            ok(f"Shellcode written to '{fd.name}'")
         return