openrisc: mm/init.c: remove unused variable 'end' in paging_init()

A build with W=1 enabled produces the following warning:

  CC      arch/openrisc/mm/init.o
arch/openrisc/mm/init.c: In function 'paging_init':
arch/openrisc/mm/init.c:131:16: warning: variable 'end' set but not used [-Wunused-but-set-variable]
  131 |  unsigned long end;
      |                ^~~

Remove the unused variable 'end'.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>

arch/openrisc/mm/init.c

@@ -128,7 +128,6 @@ void __init paging_init(void)
 {
 	extern void tlb_init(void);
 
-	unsigned long end;
 	int i;
 
 	printk(KERN_INFO "Setting up paging and PTEs.\n");
@@ -144,8 +143,6 @@ void __init paging_init(void)
 	 */
 	current_pgd[smp_processor_id()] = init_mm.pgd;
 
-	end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);
-
 	map_ram();
 
 	zone_sizes_init();