hugemmap11.c: Change NORMAL_PATH to current working directory

Following error will happen on sle-micro system since "/" is read only:
tst_test.c:1062: TBROK: open(/ltp_hug9Iy6OR,16578,10247520240) failed: EROFS (30)

Link: https://lore.kernel.org/ltp/[email protected]/
Reviewed-by: Petr Vorel <[email protected]>
Reviewed-by: Li Wang <[email protected]>
Signed-off-by: Wei Gao <[email protected]>

testcases/kernel/mem/hugetlb/hugemmap/hugemmap11.c

@@ -23,7 +23,7 @@
 
 #define P0 "ffffffff"
 #define IOSZ 4096
-#define NORMAL_PATH ""
+#define NORMAL_PATH "./"
 #define MNTPOINT "hugetlbfs/"
 
 static long hpage_size;