[PATCH v4] hw/i386/intel_iommu: Simplify vtd_find_as_from_bus_num() logic

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

The vtd_find_as_from_bus_num() function was introduced (in commit
dbaabb25f) in a code format that could return an incorrect pointer,
which was later fixed by commit a2e1cd41ccf.
We could have avoided this by writing the if() statement differently.
Do it now, in case this function is re-used. The code is easier to
review (harder to miss bugs).

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
Since v1: Re-worded commit description, patch sent without -w.
Since v2: patch send without diff
Since v3: Fix typo in description and comment (Eric Auger)

This patch is easier to review with 'git-diff -w' (--ignore-all-space)
---
 hw/i386/intel_iommu.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 6258c58ac9..204b6841ec 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -987,24 +987,26 @@ static bool vtd_slpte_nonzero_rsvd(uint64_t slpte, uint32_t level)
 static VTDBus *vtd_find_as_from_bus_num(IntelIOMMUState *s, uint8_t bus_num)
 {
     VTDBus *vtd_bus = s->vtd_as_by_bus_num[bus_num];
-    if (!vtd_bus) {
-        /*
-         * Iterate over the registered buses to find the one which
-         * currently hold this bus number, and update the bus_num
-         * lookup table:
-         */
-        GHashTableIter iter;
+    GHashTableIter iter;
 
-        g_hash_table_iter_init(&iter, s->vtd_as_by_busptr);
-        while (g_hash_table_iter_next(&iter, NULL, (void **)&vtd_bus)) {
-            if (pci_bus_num(vtd_bus->bus) == bus_num) {
-                s->vtd_as_by_bus_num[bus_num] = vtd_bus;
-                return vtd_bus;
-            }
-        }
-        vtd_bus = NULL;
+    if (vtd_bus) {
+        return vtd_bus;
     }
-    return vtd_bus;
+
+    /*
+     * Iterate over the registered buses to find the one which
+     * currently holds this bus number and update the bus_num
+     * lookup table.
+     */
+    g_hash_table_iter_init(&iter, s->vtd_as_by_busptr);
+    while (g_hash_table_iter_next(&iter, NULL, (void **)&vtd_bus)) {
+        if (pci_bus_num(vtd_bus->bus) == bus_num) {
+            s->vtd_as_by_bus_num[bus_num] = vtd_bus;
+            return vtd_bus;
+        }
+    }
+
+    return NULL;
 }
 
 /* Given the @iova, get relevant @slptep. @slpte_level will be the last level
-- 
2.21.1