acpi: Fix an infinite loop in acpi_table_add

Commit d729bb9a7700e364b1c5f9893d61f07a9e002bce has a typo, causing an
infinite loop in acpi_table_add.

Signed-off-by: Vincent Minet <vincent@vincent-minet.net>
Acked-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/hw/acpi.c b/hw/acpi.c
index 069e05f..8071e7b 100644
--- a/hw/acpi.c
+++ b/hw/acpi.c
@@ -161,7 +161,7 @@
 
         /* off < length is necessary because file size can be changed
            under our foot */
-        while(s.st_size && off < length); {
+        while(s.st_size && off < length) {
             int r;
             r = read(fd, p + off, s.st_size);
             if (r > 0) {