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sox: silence gcc warning in headroom() function

Increase the buffer size and use snprintf() to silence gcc warning
about possible overflow/truncation.

--- a/src/sox.c

+++ b/src/sox.c

@@ -1243,9 +1243,9 @@

 static char * headroom(void)

 {

   if (min_headroom < MIN_HEADROOM) {

-    static char buff[10];

+    static char buff[16];

     unsigned h = (unsigned)(min_headroom * 10);

-    sprintf(buff, "Hd:%u.%u", h /10, h % 10);

+    snprintf(buff, sizeof(buff), "Hd:%u.%u", h /10, h % 10);

     return buff;

   }

   return "      ";