Update nvvmir.mlir

Author: grypp

mlir/test/Target/LLVMIR/nvvmir.mlir

@@ -928,4 +928,4 @@ llvm.func @nvvm_pmevent() {
   // CHECK: call void @llvm.nvvm.pm.event.mask(i16 4)
   nvvm.pmevent mask = 4
   llvm.return
-}
+}