Fix incorrect "return NULL" in BumpAllocLarge().

This must be "return MemoryContextAllocationFailure(context, size, flags)"
instead.  The effect of this oversight is that if we got a malloc
failure right here, the code would act as though MCXT_ALLOC_NO_OOM
had been specified, whether it was or not.  That would likely lead
to a null-pointer-dereference crash at the unsuspecting call site.

Noted while messing with a patch to improve our Valgrind leak
detection support.  Back-patch to v17 where this code came in.

src/backend/utils/mmgr/bump.c

@@ -316,7 +316,7 @@ BumpAllocLarge(MemoryContext context, Size size, int flags)
 
 	block = (BumpBlock *) malloc(blksize);
 	if (block == NULL)
-		return NULL;
+		return MemoryContextAllocationFailure(context, size, flags);
 
 	context->mem_allocated += blksize;