hv: bug fix in atomic.h

This patch fixes the typo introduced in atomic operaions refine.
The usage of the parameter in function body was not updated according
to the changes of input parameter.

Tracked-On: #861
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

hypervisor/include/lib/atomic.h

@@ -176,7 +176,7 @@ static inline type name(volatile type *ptr,			\
 {								\
 	type ret;						\
 	asm volatile(BUS_LOCK "cmpxchg" size " %2,%1"		\
-			: "=a" (ret), "+m" (*p)			\
+			: "=a" (ret), "+m" (*ptr)		\
 			: "r" (new), "0" (old)			\
 			: "memory");				\
 	return ret;						\
@@ -188,7 +188,7 @@ build_atomic_cmpxchg(atomic_cmpxchg64, "q", uint64_t, p, old, new)
 static inline type name(type *ptr, type v)			\
 {								\
 	asm volatile(BUS_LOCK "xadd" size " %0,%1"		\
-			: "+r" (v), "+m" (*p)			\
+			: "+r" (v), "+m" (*ptr)			\
 			:					\
 			: "cc", "memory");			\
 	return v;						\