kdumpid: Fix a 32-bit build error caused by max_pfn type mismatch

The maximum PFN is obtained with a call to kdump_get_number_attr(), which
takes a pointer to a kdump_num_t as its parameter.

Signed-off-by: Petr Tesarik <[email protected]>

Author: ptesarik

tools/kdumpid/kdumpid.h

@@ -21,7 +21,7 @@ struct dump_desc {
 
 	void *page;		/* page data buffer */
 	kdump_num_t page_size;	/* target page size */
-	unsigned long max_pfn;	/* max PFN for read_page */
+	kdump_num_t max_pfn;	/* max PFN for read_page */
 
 	const char *format;	/* format name */