Update DefaultIOSystem.cpp

Added missing whitespace

code/Common/DefaultIOSystem.cpp

@@ -102,7 +102,7 @@ bool DefaultIOSystem::Exists(const char *pFile) const {
 	struct stat statbuf;
     stat(pFile, &statbuf);
     // test for a regular file
-    if (!S_ISREG(statbuf.st_mode)){
+    if (!S_ISREG(statbuf.st_mode)) {
         return false;
     }
 #endif