9pfs: Fix warnings from Sparse

Sparse report:

9pfs/virtio-9p.c:1953:9: warning: returning void-valued expression
9pfs/virtio-9p-handle.c:143:5: warning: returning void-valued expression
9pfs/virtio-9p-handle.c:160:5: warning: returning void-valued expression
9pfs/virtio-9p-local.c:384:5: warning: returning void-valued expression
9pfs/virtio-9p-local.c:415:5: warning: returning void-valued expression
9pfs/virtio-9p-proxy.c:672:5: warning: returning void-valued expression
9pfs/virtio-9p-proxy.c:689:5: warning: returning void-valued expression

Cc: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/9pfs/virtio-9p-handle.c

@@ -140,7 +140,7 @@ static int handle_opendir(FsContext *ctx,
 
 static void handle_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
 {
-    return rewinddir(fs->dir);
+    rewinddir(fs->dir);
 }
 
 static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs)
@@ -157,7 +157,7 @@ static int handle_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
 
 static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
 {
-    return seekdir(fs->dir, off);
+    seekdir(fs->dir, off);
 }
 
 static ssize_t handle_preadv(FsContext *ctx, V9fsFidOpenState *fs,

hw/9pfs/virtio-9p-local.c

@@ -378,7 +378,7 @@ static int local_opendir(FsContext *ctx,
 
 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
 {
-    return rewinddir(fs->dir);
+    rewinddir(fs->dir);
 }
 
 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
@@ -409,7 +409,7 @@ static int local_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
 
 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
 {
-    return seekdir(fs->dir, off);
+    seekdir(fs->dir, off);
 }
 
 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,

hw/9pfs/virtio-9p-proxy.c

@@ -669,7 +669,7 @@ static int proxy_opendir(FsContext *ctx,
 
 static void proxy_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
 {
-    return rewinddir(fs->dir);
+    rewinddir(fs->dir);
 }
 
 static off_t proxy_telldir(FsContext *ctx, V9fsFidOpenState *fs)
@@ -686,7 +686,7 @@ static int proxy_readdir_r(FsContext *ctx, V9fsFidOpenState *fs,
 
 static void proxy_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
 {
-    return seekdir(fs->dir, off);
+    seekdir(fs->dir, off);
 }
 
 static ssize_t proxy_preadv(FsContext *ctx, V9fsFidOpenState *fs,

hw/9pfs/virtio-9p.c

@@ -1950,7 +1950,8 @@ static void v9fs_write(void *opaque)
 
     err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count);
     if (err < 0) {
-        return complete_pdu(s, pdu, err);
+        complete_pdu(s, pdu, err);
+        return;
     }
     offset += err;
     v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true);