Remove duplicate code in SQL escaping

Fixes #12508

Signed-off-by: Michal Čihař <michal@cihar.com>

ChangeLog

@@ -45,6 +45,7 @@ phpMyAdmin - ChangeLog
 - issue #12321 Assign LIMIT clause only to syntactically correct queries
 - issue #12461 Can't Execute SQL With Sub-Query Due To "LIMIT 0,25" Inserted At Wrong Place
 - issue #12511 Clarify documentation on ArbitraryServerRegexp
+- issue #12508 Remove duplicate code in SQL escaping
 
 4.6.4 (2016-08-16)
 - issue        [security] Weaknesses with cookie encryption, see PMASA-2016-29

libraries/Util.php

@@ -320,11 +320,7 @@ class Util
             );
         }
 
-        if ($php_code) {
-            $a_string = str_replace('\'', '\\\'', $a_string);
-        } else {
-            $a_string = str_replace('\'', '\\\'', $a_string);
-        }
+        $a_string = str_replace('\'', '\\\'', $a_string);
 
         return $a_string;
     } // end of the 'sqlAddSlashes()' function