exp: fix shift/reduce conflict complaints

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/exp/expression-parser.y b/exp/expression-parser.y
index af726a6..6ab6408 100644
--- a/exp/expression-parser.y
+++ b/exp/expression-parser.y
@@ -57,6 +57,7 @@
 %token <v> BYE
 %token <v> SUFFIX 
 %left '-' '+'
+%right SUFFIX
 %left '*' '/'
 %right '^'
 %left '%'