{
  no warnings 'uninitialized';
  if ( $ret->{'val1'} eq $this->{'val1'} ) {
    # ...
  }
}
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To figure out the name of the warnings to turn off, run your code with the diagnostics pragma. Then you'll get extended warning messages like:

Use of uninitialized value in string eq at -e line 1 (#1)
    (W uninitialized) An undefined value was used as if it were already
    defined.  It was interpreted as a "" or a 0, but maybe it was a mistake.
    To suppress this warning assign a defined value to your variables.

    To help you figure out what was undefined, perl tells you what operation
    you used the undefined value in.  Note, however, that perl optimizes your
    program and the operation displayed in the warning may not necessarily
    appear literally in your program.  For example, "that $foo" is
    usually optimized into "that " . $foo, and the warning will refer to
    the concatenation (.) operator, even though there is no . in your
    program.

The (W uninitialized) bit tells you the name of the desired argument to no warnings.