10476 file(1) could be smatch clean

@@ -851,11 +851,12 @@
         /* end modification for multibyte env */
 
         for (i = 0; i < Max; /* null */)
                 if (fbuf[i] & 0200) {
                         IS_ascii = 0;
-                        if (fbuf[0] == '\100' && fbuf[1] == '\357') {
+                        if ((fbuf[0] == '\100') &&
+                            ((uchar_t)fbuf[1] == (uchar_t)'\357')) {
                                 (void) printf(gettext("troff output\n"));
                                 return;
                         }
                 /* start modification for multibyte env */
                         if ((length = mbtowc(&wchar, &fbuf[i], MB_CUR_MAX))