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

@@ -307,13 +307,13 @@
 
         if (lvp->lv_base_va != NULL) {
                 vmem_xfree(is_64bit ? lib_va_64_arena : lib_va_32_arena,
                     lvp->lv_base_va, lvp->lv_len);
                 if (is_64bit) {
-                        atomic_add_32(&libs_mapped_64, -1);
+                        atomic_dec_32(&libs_mapped_64);
                 } else {
-                        atomic_add_32(&libs_mapped_32, -1);
+                        atomic_dec_32(&libs_mapped_32);
                 }
         }
         kmem_free(lvp, sizeof (struct lib_va));
 }
 

@@ -470,14 +470,14 @@
                 lvp->lv_flags = LV_ELF32;
         }
 
         if (base_va != NULL) {
                 if (model == DATAMODEL_LP64) {
-                        atomic_add_32(&libs_mapped_64, 1);
+                        atomic_inc_32(&libs_mapped_64);
                 } else {
                         ASSERT(model == DATAMODEL_ILP32);
-                        atomic_add_32(&libs_mapped_32, 1);
+                        atomic_inc_32(&libs_mapped_32);
                 }
         }
         ASSERT(*tmp == NULL);
         *tmp = lvp;
         mutex_exit(LIB_VA_HASH_MUTEX(index));