Homebrew nightly build not updated anymore (since 03/06)

[paulrouget]

http://build.servo.org/builders/mac-nightly/builds/260/steps/compile__1/logs/stdio

./mach package --release
 in dir /Users/servo/buildbot/slave/mac-nightly/build (timeout 1200 secs)
 watching logfiles {}
 argv: ['./mach', 'package', '--release']
 environment:
  CARGO_HOME=/Users/servo/.cargo
  CCACHE=/usr/local/bin/ccache
  HOME=/Users/servo
  LOGNAME=servo
  OPENSSL_INCLUDE_DIR=/usr/local/opt/openssl/include
  OPENSSL_LIB_DIR=/usr/local/opt/openssl/lib
  PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
  PWD=/Users/servo/buildbot/slave/mac-nightly/build
  RUST_BACKTRACE=1
  SERVO_CACHE_DIR=/Users/servo/.servo
  SHELL=/bin/bash
  TMPDIR=/var/folders/cq/ftz5g9rx2_32hlr4v5hj3sch0000gp/T/
  USER=servo
  XPC_FLAGS=0x0
  XPC_SERVICE_NAME=buildslave
  __CF_USER_TEXT_ENCODING=0x1F6:0x0:0x0
 using PTY: False
hdiutil: create failed - File exists
Creating Servo.app
Cleaning up from previous packaging
Copying files
Swapping prefs
Finding dylibs and relinking
Adding version to Credits.rtf
Writing run-servo
Creating dmg
Packaging MacOS dmg exited with return value 1
program finished with exit code 1
elapsedTime=3.583887```

[paulrouget]

@aneeshusa can you help?

[paulrouget]

@metajack fixed it.