[PATCH 26/26] lib: fwts_alloc: use ptrdiff_t to ensure non-mixed type comparison

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

When comparing difference of two pointers we should compare to
a ptrdiff_t to avoid any messy non-mixed type comparisons.

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 src/lib/src/fwts_alloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lib/src/fwts_alloc.c b/src/lib/src/fwts_alloc.c
index 4495ad4..5c61478 100644
--- a/src/lib/src/fwts_alloc.c
+++ b/src/lib/src/fwts_alloc.c
@@ -20,6 +20,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <stddef.h>
 
 #include "fwts_alloc.h"
 
@@ -75,7 +76,7 @@ static void *fwts_low_mmap(const size_t requested_size)
 
 		if ((last_addr_end != NULL) &&
 		    (last_addr_end < (void*)LIMIT_2GB)) {
-			if ((addr_start - last_addr_end) > requested_size) {
+			if ((addr_start - last_addr_end) > (ptrdiff_t)requested_size) {
 				void *addr = last_addr_end;
 				ret = mmap(addr, requested_size, PROT_READ | PROT_WRITE,
 					MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
-- 
1.7.10.4