[clang-tidy] don't use else after return

Found with readability-else-after-return

Signed-off-by: Rosen Penev <rosenp@gmail.com>

include/cxxopts.hpp

@@ -901,11 +901,8 @@ namespace cxxopts
         {
           return *m_result;
         }
-        else
-        {
         return *m_store;
       }
-      }
 
       protected:
       std::shared_ptr<T> m_result;
@@ -1657,10 +1654,7 @@ OptionAdder::operator()
     {
       return std::make_tuple(long_.str(), short_.str());
     }
-    else
-    {
     return std::make_tuple(short_.str(), long_.str());
-    }
   }(short_match, long_match);
 
   m_options.add_option
@@ -1766,23 +1760,14 @@ ParseResult::consume_positional(std::string a)
           ++m_next_positional;
           return true;
         }
-        else
-        {
         ++m_next_positional;
         continue;
       }
-      }
-      else
-      {
       add_to_option(*m_next_positional, a);
       return true;
     }
-    }
-    else
-    {
     throw_or_mimic<option_not_exists_exception>(*m_next_positional);
   }
-  }
 
   return false;
 }
@@ -1882,12 +1867,9 @@ ParseResult::parse(int& argc, char**& argv)
             {
               continue;
             }
-            else
-            {
             //error
             throw_or_mimic<option_not_exists_exception>(name);
           }
-          }
 
           auto value = iter->second;
 
@@ -1923,12 +1905,9 @@ ParseResult::parse(int& argc, char**& argv)
             ++current;
             continue;
           }
-          else
-          {
           //error
           throw_or_mimic<option_not_exists_exception>(name);
         }
-        }
 
         auto opt = iter->second;