qga/commands-posix: fix typo in qmp_guest_set_user_password

qga/commands-posix.c does not compile on FreeBSD due to a confusion
between "chpasswdata" (wrong) and "chpasswddata" (used in the #else
branch).

Fixes: 0e5b75a390 ("qga/commands-posix: qmp_guest_set_user_password: use ga_run_command helper")
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

qga/commands-posix.c

@@ -2173,7 +2173,7 @@ void qmp_guest_set_user_password(const char *username,
     }
 
 #ifdef __FreeBSD__
-    g_autofree char *chpasswdata = g_strdup(rawpasswddata);
+    g_autofree char *chpasswddata = g_strdup(rawpasswddata);
     const char *crypt_flag = crypted ? "-H" : "-h";
     const char *argv[] = {"pw", "usermod", "-n", username,
                           crypt_flag, "0", NULL};