mempolicy: clean up minor dead code in queue_pages_test_walk()

Commit 2cafb582 ("mempolicy: remove confusing MPOL_MF_LAZY dead code")
removes MPOL_MF_LAZY handling in queue_pages_test_walk(), and with that,
there is no effective use of the local variable endvma in that function
remaining.

Remove the local variable endvma and its dead code. No functional change.

This issue was identified with clang-analyzer's dead stores analysis.

Link: https://lkml.kernel.org/r/20240122092504.18377-1-lukas.bulwahn@gmail.comSigned-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/mempolicy.c

@@ -654,7 +654,6 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end,
 {
 	struct vm_area_struct *next, *vma = walk->vma;
 	struct queue_pages *qp = walk->private;
-	unsigned long endvma = vma->vm_end;
 	unsigned long flags = qp->flags;
 
 	/* range check first */
@@ -682,9 +681,6 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end,
 	    !(flags & MPOL_MF_STRICT))
 		return 1;
 
-	if (endvma > end)
-		endvma = end;
-
 	/*
 	 * Check page nodes, and queue pages to move, in the current vma.
 	 * But if no moving, and no strict checking, the scan can be skipped.