Coding Standards: Remove unnecessary unset() calls in WP_Importer…

… methods.

Variables created within the scope of a function are discarded automatically when PHP leaves the scope of the function, i.e. on `return`, so doing a call to `unset()` straight before a `return` statement is redundant.

Props jrf, ravipatel, rachelbaker, mukesh27.
Fixes #52996.

git-svn-id: https://develop.svn.wordpress.org/trunk@50692 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-importer.php

@@ -42,9 +42,6 @@ public function get_imported_posts( $importer_name, $blog_id ) {
 			}
 		} while ( count( $results ) == $limit );
 
-		// Unset to save memory.
-		unset( $results, $r );
-
 		return $hashtable;
 	}
 
@@ -72,9 +69,6 @@ public function count_imported_posts( $importer_name, $blog_id ) {
 			$count = (int) $result[0]->cnt;
 		}
 
-		// Unset to save memory.
-		unset( $results );
-
 		return $count;
 	}
 
@@ -117,9 +111,6 @@ public function get_imported_comments( $blog_id ) {
 			}
 		} while ( count( $results ) == $limit );
 
-		// Unset to save memory.
-		unset( $results, $r );
-
 		return $hashtable;
 	}