Fix psalm issues

Signed-off-by: Ion Bazan <ion.bazan@gmail.com>

Author: IonBazan

src/Check/CpuPerformance.php

@@ -120,7 +120,7 @@ public static function calcPi($precision)
         $limit = ceil(log($precision) / log(2)) - 1;
         bcscale($precision + 6);
         $a = 1;
-        $b = bcdiv(1, bcsqrt(2));
+        $b = bcdiv(1, bcsqrt(2) ?? '0');
         $t = 1 / 4;
         $p = 1;
         for ($n = 0; $n < $limit; $n++) {

src/Check/DirReadable.php

@@ -12,6 +12,7 @@
 use function get_class;
 use function implode;
 use function is_array;
+use function is_countable;
 use function is_dir;
 use function is_object;
 use function is_readable;
@@ -90,7 +91,7 @@ public function check()
             return new Failure(trim($failureString), ['nonDirs' => $nonDirs, 'unreadable' => $unreadable]);
         } else {
             return new Success(
-                count($this->dir) > 1 ? 'All paths are readable directories.' : 'The path is a readable directory.',
+                is_countable($this->dir) && count($this->dir) > 1 ? 'All paths are readable directories.' : 'The path is a readable directory.',
                 $this->dir
             );
         }

src/Check/DirWritable.php

@@ -12,6 +12,7 @@
 use function get_class;
 use function implode;
 use function is_array;
+use function is_countable;
 use function is_dir;
 use function is_object;
 use function is_string;
@@ -91,7 +92,7 @@ public function check()
             return new Failure(trim($failureString), ['nonDirs' => $nonDirs, 'unwritable' => $unwritable]);
         } else {
             return new Success(
-                count($this->dir) > 1 ? 'All paths are writable directories.' : 'The path is a writable directory.',
+                is_countable($this->dir) && count($this->dir) ? 'All paths are writable directories.' : 'The path is a writable directory.',
                 $this->dir
             );
         }

src/Check/ExtensionLoaded.php

@@ -12,6 +12,7 @@
 use function get_class;
 use function implode;
 use function is_array;
+use function is_countable;
 use function is_object;
 use function is_string;
 use function phpversion;
@@ -72,7 +73,7 @@ public function check()
                 return new Failure('Extension ' . implode('', $missing) . ' is not available.', $missing);
             }
         } else {
-            if (count($this->extensions) > 1) {
+            if (is_countable($this->extensions) && count($this->extensions) > 1) {
                 $versions = [];
                 foreach ($this->extensions as $ext) {
                     $versions[$ext] = phpversion($ext) ? : 'loaded';