e2image: If there is an error while writing a block, call exit(1)

If the disk fills while e2image is writing its output file, it will
spew a large number of error messages instead of exiting with a
non-zero status code after the first failure.

Addresses-Sourceforge-Feature-Request: #606508

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

misc/e2image.c

@@ -330,6 +330,7 @@ static void write_block(int fd, char *buf, int sparse_offset,
 				err = 0;
 			com_err(program_name, err, "error writing block %u",
 				block);
+			exit(1);
 		}
 	}
 }