zdtm/thp_disable: increase memory size to 2M

Somehow in travis tests the mmap of 8K gets "rounded" down and the actual
VMA starts 4K below the returned address. This causes /proc/pid/smaps
parsing to fail.

Increasing the allocation size to 2M seems to resolve the problem and until
the root cause is identified it looks like a viable workaround.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>

test/zdtm/static/thp_disable.c

@@ -10,7 +10,7 @@
 const char *test_doc	= "Test prctl(THP_DISABLE) behaviour";
 const char *test_author	= "Mike Rapoport <rppt@linux.ibm.com>";
 
-#define MEM_SIZE (8192)
+#define MEM_SIZE (2 << 20)
 
 int main(int argc, char **argv)
 {