write normal case before with more readable condition

brianmario#764 (comment)

Author: nurse

ext/mysql2/statement.c

@@ -290,10 +290,14 @@ static VALUE execute(int argc, VALUE *argv, VALUE self) {
 #endif
           break;
         case T_BIGNUM:
-          bind_buffers[i].buffer_type = MYSQL_TYPE_LONGLONG;
           {
               LONG_LONG num;
-              if (my_big2ll(argv[i], &num)) {
+              if (my_big2ll(argv[i], &num) == 0) {
+                  bind_buffers[i].buffer_type = MYSQL_TYPE_LONGLONG;
+                  bind_buffers[i].buffer = xmalloc(sizeof(long long int));
+                  *(LONG_LONG*)(bind_buffers[i].buffer) = num;
+              } else {
+                  /* The bignum was larger than we can fit in LONG_LONG, send it as a string */
                   VALUE rb_val_as_string = rb_big2str(argv[i], 10);
                   bind_buffers[i].buffer_type = MYSQL_TYPE_NEWDECIMAL;
                   params_enc[i] = rb_val_as_string;
@@ -302,10 +306,6 @@ static VALUE execute(int argc, VALUE *argv, VALUE self) {
 #endif
                   set_buffer_for_string(&bind_buffers[i], &length_buffers[i], params_enc[i]);
               }
-              else {
-                  bind_buffers[i].buffer = xmalloc(sizeof(long long int));
-                  *(LONG_LONG*)(bind_buffers[i].buffer) = num;
-              }
           }
           break;
         case T_FLOAT: