Description of problem:
xvidtune crashes.  gcc fortify backtrace produced.

Version-Release number of selected component (if applicable):
xorg-x11-server-utils-1.0.1-1.2

How reproducible:
always

Steps to Reproduce:
1. run xvidtune
  
Actual results:
crash

Expected results:
no crash

Additional info:
glibc detects a buffer overflow in the sprintf.  A 10-byte buffer is not big
enough to contain a number that large.

(gdb) frame 11
#11 0x0804af70 in CreateTyp (form=0x8fc5100, findex=PixelClock, w1name=Variable
"w1name" is not available.
)
    at xvidtune.c:968
968             (void) sprintf(buf, "%6.2f", (float)AppRes.field[findex].val /
1000.0);
(gdb) l
963         Widget wids[3];
964         char buf[10];
965
966         wids[0] = XtCreateWidget (w1name, labelWidgetClass, form, NULL, 0);
967         if (findex >= PixelClock && findex <= VSyncRate)
968             (void) sprintf(buf, "%6.2f", (float)AppRes.field[findex].val /
1000.0);
969         else
970             (void) sprintf (buf, "%5d", AppRes.field[findex].val);
971         wids[1] = XtVaCreateWidget (w2name, labelWidgetClass,
972                     form, XtNlabel, buf, NULL);

(gdb) p buf
$5 = "1889173.9"    # note 9 bytes + \0 used; no space for second decimal place