tests: simplify formatting

The shell version would output 40 extra spaces for a test with
a multiple of 40 sub-tests, and the C version can use the same
printf optimization for avoiding a loop over single space output
as the shell version.

* tests/testutils.c (virtTestMain): Avoid loop for alignment.
* tests/test-lib.sh: Fix formatting when counter is multiple of 40.

tests/test-lib.sh

@@ -54,7 +54,7 @@ test_final()
   status=$2
 
   if test "$verbose" = "0" ; then
-    len=`expr 40 - \( $counter % 40 \)`
+    len=`expr 39 - \( \( $counter - 1 \) % 40 \)`
     printf "%${len}s" ""
     if test "$status" = "0" ; then
       printf " %-3d OK\n" $counter

tests/testutils.c

@@ -693,9 +693,8 @@ cleanup:
         VIR_FREE(abs_srcdir);
     virResetLastError();
     if (!virTestGetVerbose() && ret != EXIT_AM_SKIP) {
-        int i;
-        for (i = (testCounter % 40) ; i > 0 && i < 40 ; i++)
-            fprintf(stderr, " ");
+        if (testCounter == 0 || testCounter % 40)
+            fprintf(stderr, "%*s", 40 - (testCounter % 40), "");
         fprintf(stderr, " %-3d %s\n", testCounter, ret == 0 ? "OK" : "FAIL");
     }
     return ret;