mempath prefault: fix off-by-one error

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Fix off-by-one error (noticed by Andrea Arcangeli).

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/exec.c b/exec.c
index f4b9ef2..1be5252 100644
--- a/exec.c
+++ b/exec.c
@@ -1000,7 +1000,7 @@ static void *file_ram_alloc(RAMBlock *block,
         }
 
         /* MAP_POPULATE silently ignores failures */
-        for (i = 0; i < (memory/hpagesize)-1; i++) {
+        for (i = 0; i < (memory/hpagesize); i++) {
             memset(area + (hpagesize*i), 0, 1);
         }
 
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