Remove unnecessary assignment by reference

From dhx's list, most items are in fact not pass-by-references at all.
The list returned by the following command excludes obvious false
positives, and the remaining occurences are not pass-by-references
either.

$ git grep '&\$' |grep -vE "function|Binary|@param"

Fixes #10976

admin/install.php

@@ -392,7 +392,7 @@ function InsertData( $p_table, $p_data ) {
 			$f_db_exists = true;
 		}
 		if( $f_db_type == 'db2' ) {
-			$result = &$g_db->execute( 'set schema ' . $f_db_schema );
+			$result = $g_db->execute( 'set schema ' . $f_db_schema );
 			if( $result === false ) {
 				print_test_result( BAD, true, 'set schema failed: ' . $g_db->errorMsg() );
 			}
@@ -424,7 +424,7 @@ function InsertData( $p_table, $p_data ) {
 		if( $t_result == true ) {
 			$t_db_open = true;
 			if( $f_db_type == 'db2' ) {
-				$result = &$g_db->execute( 'set schema ' . $f_db_schema );
+				$result = $g_db->execute( 'set schema ' . $f_db_schema );
 				if( $result === false ) {
 					print_test_result( BAD, true, 'set schema failed: ' . $g_db->errorMsg() );
 				}
@@ -735,7 +735,7 @@ function InsertData( $p_table, $p_data ) {
 				$t_result = false;
 				echo $g_db->errorMsg();
 			} else {
-				$t_result = &$g_db->execute( 'set schema ' . $f_db_schema );
+				$t_result = $g_db->execute( 'set schema ' . $f_db_schema );
 			}
 		}
 
@@ -752,7 +752,7 @@ function InsertData( $p_table, $p_data ) {
 			$dict = NewDataDictionary( $g_db );
 
 			if( $f_db_type == 'db2' ) {
-				$rs = &$g_db->Execute( "CREATE SCHEMA " . $f_db_schema );
+				$rs = $g_db->Execute( "CREATE SCHEMA " . $f_db_schema );
 
 				if( !$rs ) {
 					$t_result = false;
@@ -801,7 +801,7 @@ function InsertData( $p_table, $p_data ) {
 		$t_result = @$g_db->Connect( $f_hostname, $f_db_username, $f_db_password, $f_database_name );
 
 		if( $f_db_type == 'db2' ) {
-			$result = &$g_db->execute( 'set schema ' . $f_db_schema );
+			$result = $g_db->execute( 'set schema ' . $f_db_schema );
 			if( $result === false ) {
 				echo $g_db->errorMsg();
 			}
@@ -851,7 +851,7 @@ function InsertData( $p_table, $p_data ) {
 		}
 
 		if( $f_db_type == 'db2' ) {
-			$result = &$g_db->execute( 'set schema ' . $f_db_schema );
+			$result = $g_db->execute( 'set schema ' . $f_db_schema );
 			if( $result === false ) {
 				echo $g_db->errorMsg();
 			}
@@ -1125,7 +1125,7 @@ function InsertData( $p_table, $p_data ) {
 	}
 
 	if( $f_db_type == 'db2' ) {
-		$result = &$g_db->execute( 'set schema ' . $f_db_schema );
+		$result = $g_db->execute( 'set schema ' . $f_db_schema );
 		if( $result === false ) {
 			echo $g_db->errorMsg();
 		}