kexec: remove redundant assignments

Get rid of redundant assignments which end up in values not being read
either because they are overwritten or the function ends.

Reported by clang-tidy [deadcode.DeadStores]

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Michal Orzel <[e-mail]>
Acked-by: Baoquan He <[e-mail]>
Cc: Eric Biederman <[e-mail]>
Cc: Nathan Chancellor <[e-mail]>
Cc: Nick Desaulniers <[e-mail]>
Cc: Michal Orzel <[e-mail]>

Signed-off-by: Andrew Morton <[e-mail]>

kernel/kexec_core.c

···
 				kimage_free_pages(old_page);
 				continue;
 			}
-			addr = old_addr;
 			page = old_page;
 			break;
 		}
···
 	unsigned char __user *buf = NULL;
 	unsigned char *kbuf = NULL;
 
-	result = 0;
 	if (image->file_mode)
 		kbuf = segment->kbuf;
 	else