5045 use atomic_{inc,dec}_* instead of atomic_add_*

@@ -357,17 +357,16 @@
         else                                                    \
                 rval = 1;                                       \
 }
 
 #define SF_SCD_INCR_REF(scdp) {                                         \
-        atomic_add_32((volatile uint32_t *)&(scdp)->scd_refcnt, 1);     \
+        atomic_inc_32((volatile uint32_t *)&(scdp)->scd_refcnt);        \
 }
 
 #define SF_SCD_DECR_REF(srdp, scdp) {                           \
         sf_region_map_t _scd_rmap = (scdp)->scd_region_map;     \
-        if (!atomic_add_32_nv(                                  \
-            (volatile uint32_t *)&(scdp)->scd_refcnt, -1)) {    \
+        if (!atomic_dec_32_nv((volatile uint32_t *)&(scdp)->scd_refcnt)) {\
                 sfmmu_destroy_scd((srdp), (scdp), &_scd_rmap);  \
         }                                                       \
 }
 
 /*