[Qemu-block] [PATCH v7 13/16] nbd: Refactor conversion to errno to silence checkpatch

[Eric Blake]

Checkpatch complains that 'return EINVAL' is usually wrong
(since we tend to favor 'return -EINVAL').  But it is a
false positive for nbd_errno_to_system_errno().  Since NBD
may add future defined wire values, refactor the code to
keep checkpatch happy.

Signed-off-by: Eric Blake <address@hidden>
---
v7: new patch
---
 nbd/client.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/nbd/client.c b/nbd/client.c
index f5e4c74..c6da4c4 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -23,23 +23,31 @@

 static int nbd_errno_to_system_errno(int err)
 {
+    int ret;
     switch (err) {
     case NBD_SUCCESS:
-        return 0;
+        ret = 0;
+        break;
     case NBD_EPERM:
-        return EPERM;
+        ret = EPERM;
+        break;
     case NBD_EIO:
-        return EIO;
+        ret = EIO;
+        break;
     case NBD_ENOMEM:
-        return ENOMEM;
+        ret = ENOMEM;
+        break;
     case NBD_ENOSPC:
-        return ENOSPC;
+        ret = ENOSPC;
+        break;
     default:
         TRACE("Squashing unexpected error %d to EINVAL", err);
         /* fallthrough */
     case NBD_EINVAL:
-        return EINVAL;
+        ret = EINVAL;
+        break;
     }
+    return ret;
 }

 /* Definitions for opaque data types */
-- 
2.7.4