Ensure tempfile is unlinked

src/PIL/GifImagePlugin.py

@@ -616,6 +616,7 @@ def _save_netpbm(im, fp, filename):
     # below for information on how to enable this.
     tempfile = im._dump()
 
+    try:
         with open(filename, "wb") as f:
             if im.mode != "RGB":
                 subprocess.check_call(
@@ -630,7 +631,10 @@ def _save_netpbm(im, fp, filename):
                     quant_cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL
                 )
                 togif_proc = subprocess.Popen(
-                togif_cmd, stdin=quant_proc.stdout, stdout=f, stderr=subprocess.DEVNULL
+                    togif_cmd,
+                    stdin=quant_proc.stdout,
+                    stdout=f,
+                    stderr=subprocess.DEVNULL,
                 )
 
                 # Allow ppmquant to receive SIGPIPE if ppmtogif exits
@@ -643,7 +647,7 @@ def _save_netpbm(im, fp, filename):
                 retcode = togif_proc.wait()
                 if retcode:
                     raise subprocess.CalledProcessError(retcode, togif_cmd)
-
+    finally:
         try:
             os.unlink(tempfile)
         except OSError: