ntdll: Avoid comparing the result of pointer arithmetic to zero.

gcc warns about this: ../wine/dlls/ntdll/unix/virtual.c: In function ‘mmap_add_reserved_area’: ../wine/dlls/ntdll/unix/virtual.c:241:9: error: the comparison will always evaluate as ‘true’ for the pointer operand in ‘(char *)addr + (sizetype)size’ must not be NULL [-Werror=address] 241 | if (!((char *)addr + size)) size--; /* avoid wrap-around */ | ^

ntdll: Avoid comparing the result of pointer arithmetic to zero.
539ef7c4 · Zebediah Figura · Alexandre Julliard · 5965771a · 539ef7c4
Commit 539ef7c4 authored Sep 11, 2022 by Zebediah Figura Committed by Alexandre Julliard Sep 16, 2022
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virtual.c dlls/ntdll/unix/virtual.c +2 -2

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--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -238,7 +238,7 @@ static void mmap_add_reserved_area( void *addr, SIZE_T size )
    struct reserved_area *area;
    struct list *ptr;

-    if (!((char *)addr + size)) size--;  /* avoid wrap-around */
+    if (!((intptr_t)addr + size)) size--;  /* avoid wrap-around */

    LIST_FOR_EACH( ptr, &reserved_areas )
    {
@@ -287,7 +287,7 @@ static void mmap_remove_reserved_area( void *addr, SIZE_T size )
    struct reserved_area *area;
    struct list *ptr;

-    if (!((char *)addr + size)) size--;  /* avoid wrap-around */
+    if (!((intptr_t)addr + size)) size--;  /* avoid wrap-around */

    ptr = list_head( &reserved_areas );
    /* find the first area covering address */