Fix mixed indentation (and other whitespace issues)

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6094)

apps/spkac.c

diff --git a/apps/spkac.c b/apps/spkac.c
index 8ed9dd9..f384af6 100644
--- a/apps/spkac.c
+++ b/apps/spkac.c
@@ -98,7 +98,7 @@
         case OPT_KEYFORM:
             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyformat))
                 goto opthelp;
-	    break;
+            break;
         case OPT_CHALLENGE:
             challenge = opt_arg();
             break;