Delete the FileBackedOutputStream temp file if writing to it fails.

We don't delete the temp file when the stream is closed, because that would be a change in observable behaviour.

Fixes #1664.

RELNOTES=If writing to the temp file in `FileBackedOutputStream` fails, we now delete it before propagating the exception.
PiperOrigin-RevId: 369433020

android/guava/src/com/google/common/io/FileBackedOutputStream.java

@@ -225,12 +225,17 @@ private void update(int len) throws IOException {
         // this is insurance.
         temp.deleteOnExit();
       }
-      FileOutputStream transfer = new FileOutputStream(temp);
-      transfer.write(memory.getBuffer(), 0, memory.getCount());
-      transfer.flush();
+      try {
+        FileOutputStream transfer = new FileOutputStream(temp);
+        transfer.write(memory.getBuffer(), 0, memory.getCount());
+        transfer.flush();
+        // We've successfully transferred the data; switch to writing to file
+        out = transfer;
+      } catch (IOException e) {
+        temp.delete();
+        throw e;
+      }
 
-      // We've successfully transferred the data; switch to writing to file
-      out = transfer;
       file = temp;
       memory = null;
     }

guava/src/com/google/common/io/FileBackedOutputStream.java

@@ -224,12 +224,17 @@ private void update(int len) throws IOException {
         // this is insurance.
         temp.deleteOnExit();
       }
-      FileOutputStream transfer = new FileOutputStream(temp);
-      transfer.write(memory.getBuffer(), 0, memory.getCount());
-      transfer.flush();
+      try {
+        FileOutputStream transfer = new FileOutputStream(temp);
+        transfer.write(memory.getBuffer(), 0, memory.getCount());
+        transfer.flush();
+        // We've successfully transferred the data; switch to writing to file
+        out = transfer;
+      } catch (IOException e) {
+        temp.delete();
+        throw e;
+      }
 
-      // We've successfully transferred the data; switch to writing to file
-      out = transfer;
       file = temp;
       memory = null;
     }