Avoid typecasting to float when not needed

Fixes #12303

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

ChangeLog

@@ -12,6 +12,7 @@ phpMyAdmin - ChangeLog
 - issue #12414 Fixed rendering of Original theme
 - issue #12413 Fixed deleting users in non English locales
 - issue #12416 Fixed replication status output in Databases listing
+- issue #12303 Avoid typecasting to float when not needed
 
 4.6.3 (2016-06-23)
 - issue #12249 Fixed cookie path on Windows

libraries/Util.php

@@ -85,7 +85,7 @@ class Util
              $pow = gmp_strval(gmp_pow($base, $exp));
             break;
         case 'pow' :
-            $base = (float) $base;
+            $base = $base;
             $exp = (int) $exp;
             $pow = pow($base, $exp);
             break;
@@ -1461,8 +1461,7 @@ class Util
         $unit = $byteUnits[0];
 
         for ($d = 6, $ex = 15; $d >= 1; $d--, $ex-=3) {
-            // cast to float to avoid overflow
-            $unitSize = (float) $li * self::pow(10, $ex);
+            $unitSize = $li * self::pow(10, $ex);
             if (isset($byteUnits[$d]) && $value >= $unitSize) {
                 // use 1024.0 to avoid integer overflow on 64-bit machines
                 $value = round($value / (self::pow(1024, $d) / $dh)) /$dh;