update punctuation in error message

Author: Wolfram70

mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp

@@ -872,7 +872,7 @@ LogicalResult ShflOp::verify() {
   auto verifyTypeError = [&](Twine desc, Type expectedType,
                              Type actualType) -> LogicalResult {
     return emitOpError("expected " + desc + " to be of type ")
-           << expectedType << " but got " << actualType << " instead.";
+           << expectedType << " but got " << actualType << " instead";
   };
 
   if (returnStructType) {

mlir/test/Target/LLVMIR/nvvm/shfl-sync-invalid.mlir

@@ -10,13 +10,13 @@ func.func @nvvm_invalid_shfl_pred(%arg0 : i32, %arg1 : f32, %arg2 : i32, %arg3 :
 // -----
 
 func.func @nvvm_invalid_shfl_invalid_return_type_1(%arg0 : i32, %arg1 : f32, %arg2 : i32, %arg3 : i32) {
-  // expected-error@+1 {{expected return type to be of type 'f32' but got 'i32' instead.}}
+  // expected-error@+1 {{expected return type to be of type 'f32' but got 'i32' instead}}
   %0 = nvvm.shfl.sync bfly %arg0, %arg1, %arg2, %arg3 : f32 -> i32
 }
 
 // -----
 
 func.func @nvvm_invalid_shfl_invalid_return_type_2(%arg0 : i32, %arg1 : f32, %arg2 : i32, %arg3 : i32) {
-  // expected-error@+1 {{expected first element in the returned struct to be of type 'f32' but got 'i32' instead.}}
+  // expected-error@+1 {{expected first element in the returned struct to be of type 'f32' but got 'i32' instead}}
   %0 = nvvm.shfl.sync bfly %arg0, %arg1, %arg2, %arg3 {return_value_and_is_valid} : f32 -> !llvm.struct<(i32, i1)>
 }