ARM: davinci: clock: return 0 upon error from clk_round_rate()

clk_round_rate() should return 0 now upon an error, rather than returning
a negative error code.  This is because clk_round_rate() is being changed
to return an unsigned return type rather than a signed type, since some
clock sources can generate rates higher than (2^31)-1 Hz.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Philip Avinash <avinashphilip@ti.com>
Cc: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/mach-davinci/clock.c

@@ -133,7 +133,7 @@ EXPORT_SYMBOL(clk_get_rate);
 long clk_round_rate(struct clk *clk, unsigned long rate)
 {
 	if (clk == NULL || IS_ERR(clk))
-		return -EINVAL;
+		return 0;
 
 	if (clk->round_rate)
 		return clk->round_rate(clk, rate);