tests/lint: move a platform-specific test

The test failed on i386, as ptrdiff_t fits in a uint32_t after
conversion, thus not generating a warning.

Author: rillig

tests/usr.bin/xlint/lint1/msg_132.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: msg_132.c,v 1.52 2025/01/02 20:02:59 rillig Exp $	*/
+/*	$NetBSD: msg_132.c,v 1.53 2025/01/03 01:27:35 rillig Exp $	*/
 # 3 "msg_132.c"
 
 // Test for message: conversion from '%s' to '%s' may lose accuracy [132]
@@ -424,8 +424,6 @@ test_ic_minus(void)
 
 	ptr = ptr - 3;
 	s64 = ptr + 3 - ptr;
-	/* expect+1: warning: conversion from 'long' to 'unsigned int' may lose accuracy [132] */
-	u32 = ptr + 3 - ptr;
 }
 
 void

tests/usr.bin/xlint/lint1/msg_132_lp64.c

@@ -1,14 +1,26 @@
-/*	$NetBSD: msg_132_lp64.c,v 1.2 2023/07/07 19:45:22 rillig Exp $	*/
+/*	$NetBSD: msg_132_lp64.c,v 1.3 2025/01/03 01:27:35 rillig Exp $	*/
 # 3 "msg_132_lp64.c"
 
 // Test for message: conversion from '%s' to '%s' may lose accuracy [132]
 
 /* lint1-extra-flags: -a -X 351 */
 /* lint1-only-if: lp64 */
 
+typedef unsigned int u32_t;
+
+u32_t u32;
+const char *ptr;
+
 unsigned int
-convert_pointer_to_smaller_integer(void *ptr)
+convert_pointer_to_smaller_integer(void)
 {
 	/* expect+1: warning: conversion from 'unsigned long' to 'unsigned int' may lose accuracy [132] */
 	return (unsigned long)(ptr) >> 12;
 }
+
+void
+test_ic_minus(void)
+{
+	/* expect+1: warning: conversion from 'long' to 'unsigned int' may lose accuracy [132] */
+	u32 = ptr + 3 - ptr;
+}