[patch] mprotect.2: update example program

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man-pages version: latest git repository
why: The description of the example program says that it makes
the third page "read-only". Thus PROT_READ instead of PROT_NONE.

diff --git a/man2/mprotect.2 b/man2/mprotect.2
--- a/man2/mprotect.2
+++ b/man2/mprotect.2
@@ -207,7 +207,7 @@ main(int argc, char *argv[])
printf("Start of region: 0x%lx\\n", (long) buffer);

if (mprotect(buffer + pagesize * 2, pagesize,
- PROT_NONE) == \-1)
+ PROT_READ) == \-1)

for (p = buffer ; ; )

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