tests: use g_strdup instead of VIR_STRDUP

Replace all occurrences of
  if (VIR_STRDUP(a, b) < 0)
     /* effectively dead code */
with:
  a = g_strdup(b);

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

tests/scsihosttest.c

@@ -253,10 +253,7 @@ mymain(void)
     char *fakerootdir = NULL;
     char *fakesysfsdir = NULL;
 
-    if (VIR_STRDUP_QUIET(fakerootdir, FAKEROOTDIRTEMPLATE) < 0) {
-        fprintf(stderr, "Out of memory\n");
-        goto cleanup;
-    }
+    fakerootdir = g_strdup(FAKEROOTDIRTEMPLATE);
 
     if (!mkdtemp(fakerootdir)) {
         fprintf(stderr, "Cannot create fakerootdir");