lib/vsprintf.c: implement printf() in terms of vprintf()

This saves some code, both in terms of #LOC and .text size, and it is
also the normal convention that foo(...) is implemented in terms of
vfoo().

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

lib/vsprintf.c

@@ -787,22 +787,11 @@ int printf(const char *fmt, ...)
 {
 	va_list args;
 	uint i;
-	char printbuffer[CONFIG_SYS_PBSIZE];
 
 	va_start(args, fmt);
-
-	/*
-	 * For this to work, printbuffer must be larger than
-	 * anything we ever want to print.
-	 */
-	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
+	i = vprintf(fmt, args);
 	va_end(args);
 
-	/* Handle error */
-	if (i <= 0)
-		return i;
-	/* Print the string */
-	puts(printbuffer);
 	return i;
 }