Fix a variable logic and add a brace pair (#1890)

* getoptx.c threw a compiler warning - and rightfully. This patch fixes
the logic of one variable with and without STRICT being defined.
Fix one missing brace pair on the way.

* 2nd attempt - non-intrusive

---------

Co-authored-by: Florian Zimmermann <florianzimmermann@duck.com>

elks/tools/mfs/getoptx.c

@@ -39,9 +39,10 @@ getoptX(int argc, char *const *argv, const char *optstring)
 /* allowed args, e.g. "ab:c" */
 {
    static int sp = 1;		/* position within argument */
-   register int osp;		/* saved `sp' for param test */
 #ifndef STRICT
    register int oind;		/* saved `optind' for param test */
+#else
+   register int osp;		/* saved `sp' for param test */
 #endif
    register int c;		/* option letter */
    register char *cp;		/* -> option in `optstring' */
@@ -61,7 +62,10 @@ getoptX(int argc, char *const *argv, const char *optstring)
       }
    }
    c = argv[optind][sp];	/* option letter */
-   osp = sp++;			/* get ready for next letter */
+#ifdef STRICT
+   osp = sp;
+#endif
+   sp++;			/* get ready for next letter */
 
 #ifndef STRICT
    oind = optind;		/* save optind for param test */
@@ -96,11 +100,13 @@ getoptX(int argc, char *const *argv, const char *optstring)
       else
 #endif
       if (optind >= argc)
+      {
 	 return Err(argv[0], "option requires an argument", c);
-
+      }
       else			/* argument w/ whitespace */
+      {
 	 optarg = argv[optind];
-
+      }
       ++optind;			/* skip over parameter */
    }