fix: ensure sentinel value is passed through

---
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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/find/lib/validate.js

@@ -41,6 +41,7 @@ var format = require( '@stdlib/string/format' );
 * @param {Options} options - function options
 * @param {boolean} [options.keepdims] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
 * @param {IntegerArray} [options.dims] - list of dimensions over which to perform a reduction
+* @param {(*|ndarray)} [options.sentinelValue] - sentinel value
 * @returns {(Error|null)} null or an error object
 *
 * @example
@@ -81,6 +82,9 @@ function validate( opts, ndims, options ) {
 		}
 		opts.dims = tmp;
 	}
+	if ( hasOwnProp( options, 'sentinelValue' ) ) {
+		opts.sentinelValue = options.sentinelValue;
+	}
 	return null;
 }