[PATCH] softmmu/device_tree: Silence compiler warning with --enable-sanitizers

[Thomas Huth <thuth@redhat.com>]

If I configure my build with --enable-sanitizers, my GCC (v8.5.0)
complains:

.../softmmu/device_tree.c: In function ‘qemu_fdt_add_path’:
.../softmmu/device_tree.c:560:18: error: ‘retval’ may be used uninitialized
 in this function [-Werror=maybe-uninitialized]
     int namelen, retval;
                  ^~~~~~

It's a false warning since the while loop is always executed at least
once (p has to be non-NULL, otherwise the derefence in the if-statement
earlier will crash). Thus let's switch to a do-while loop here instead
to make the compiler happy in all cases.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 softmmu/device_tree.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/softmmu/device_tree.c b/softmmu/device_tree.c
index 3965c834ca..9e96f5ecd5 100644
--- a/softmmu/device_tree.c
+++ b/softmmu/device_tree.c
@@ -564,7 +564,7 @@ int qemu_fdt_add_path(void *fdt, const char *path)
         return -1;
     }
 
-    while (p) {
+    do {
         name = p + 1;
         p = strchr(name, '/');
         namelen = p != NULL ? p - name : strlen(name);
@@ -584,7 +584,7 @@ int qemu_fdt_add_path(void *fdt, const char *path)
         }
 
         parent = retval;
-    }
+    } while (p);
 
     return retval;
 }
-- 
2.27.0