Refactor branching to assignment

Cherry-picked from #479

Author: juanxo

ext/mysql2/result.c

@@ -446,7 +446,7 @@ static VALUE rb_mysql_result_each(int argc, VALUE * argv, VALUE self) {
   mysql2_result_wrapper * wrapper;
   unsigned long i;
   const char * errstr;
-  int symbolizeKeys = 0, asArray = 0, castBool = 0, cacheRows = 1, cast = 1;
+  int symbolizeKeys, asArray, castBool, cacheRows, cast;
   MYSQL_FIELD * fields = NULL;
 
   GetMysql2Result(self, wrapper);
@@ -459,25 +459,11 @@ static VALUE rb_mysql_result_each(int argc, VALUE * argv, VALUE self) {
     opts = defaults;
   }
 
-  if (rb_hash_aref(opts, sym_symbolize_keys) == Qtrue) {
-    symbolizeKeys = 1;
-  }
-
-  if (rb_hash_aref(opts, sym_as) == sym_array) {
-    asArray = 1;
-  }
-
-  if (rb_hash_aref(opts, sym_cast_booleans) == Qtrue) {
-    castBool = 1;
-  }
-
-  if (rb_hash_aref(opts, sym_cache_rows) == Qfalse) {
-    cacheRows = 0;
-  }
-
-  if (rb_hash_aref(opts, sym_cast) == Qfalse) {
-    cast = 0;
-  }
+  symbolizeKeys = RTEST(rb_hash_aref(opts, sym_symbolize_keys));
+  asArray       = rb_hash_aref(opts, sym_as) == sym_array;
+  castBool      = RTEST(rb_hash_aref(opts, sym_cast_booleans));
+  cacheRows     = RTEST(rb_hash_aref(opts, sym_cache_rows));
+  cast          = RTEST(rb_hash_aref(opts, sym_cast));
 
   if (wrapper->is_streaming && cacheRows) {
     rb_warn("cacheRows is ignored if streaming is true");