Fix infinite loop in logger.

When there where was more arguments then "{}" in the format string
program hanged up due to infinite loop in format function.

Signed-off-by: Łukasz Plewa <lukasz.plewa@intel.com>

source/common/logger/ur_sinks.hpp

@@ -110,6 +110,14 @@ class Sink {
                               << "Closing curly brace not escaped!" << std::endl;
                 }
             }
+
+            if (*fmt == '\0') {
+                std::cerr << error_prefix
+                          << "Too many arguments!" << std::endl;
+                // ignore all left arguments and finalize message
+                format(buffer, fmt);
+                return;
+            }
         }
 
         format(buffer, ++fmt, std::forward<Args &&>(args)...);