fixed file_exists and dir_exists

src/Filesystem/dir.c

@@ -12,13 +12,13 @@ bool dir_exists(const char* path){
 #if KFS_USE_WINDOWS_H
     DWORD dwAttrib = GetFileAttributes(path);
     return (bool)(
-        (dwAttrib != INVALID_FILE_ATTRIBUTES) & // file exists
+        (dwAttrib != INVALID_FILE_ATTRIBUTES) && // file exists
         (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)); // file is a directory
 #else
     struct stat stats;
     i32 rez=stat(path, &stats);
     return (bool)(
-        (rez!=-1) & // file exists
+        (rez!=-1) && // file exists
         (S_ISDIR(stats.st_mode))); // file is a directory
 #endif
 }