ia64: module: use swap() to make code cleaner

Use the macro 'swap()' defined in 'include/linux/minmax.h' to avoid
opencoding it.

Link: https://lkml.kernel.org/r/20211104062642.1506539-1-yang.guang5@zte.com.cnSigned-off-by: Yang Guang <yang.guang5@zte.com.cn>
Reported-by: Zeal Robot <zealci@zte.com.cn>
Cc: David Yang <davidcomponentone@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/ia64/kernel/module.c

@@ -848,7 +848,7 @@ register_unwind_table (struct module *mod)
 {
 	struct unw_table_entry *start = (void *) mod->arch.unwind->sh_addr;
 	struct unw_table_entry *end = start + mod->arch.unwind->sh_size / sizeof (*start);
-	struct unw_table_entry tmp, *e1, *e2, *core, *init;
+	struct unw_table_entry *e1, *e2, *core, *init;
 	unsigned long num_init = 0, num_core = 0;
 
 	/* First, count how many init and core unwind-table entries there are.  */
@@ -865,9 +865,7 @@ register_unwind_table (struct module *mod)
 	for (e1 = start; e1 < end; ++e1) {
 		for (e2 = e1 + 1; e2 < end; ++e2) {
 			if (e2->start_offset < e1->start_offset) {
-				tmp = *e1;
-				*e1 = *e2;
-				*e2 = tmp;
+				swap(*e1, *e2);
 			}
 		}
 	}