Fix tosa_dac_recv warning

This patch fixes:

/scratch/froydnj/qemu.git/hw/tosa.c:176: warning: no previous prototype for 'tosa_dac_recv'

by making the function static.
Signed-off-by: NNathan Froyd <froydnj@codesourcery.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6551 c046a42c-6fe2-441c-8c8c-71466251a162

hw/tosa.c

@@ -172,7 +172,7 @@ static void tosa_dac_event(i2c_slave *i2c, enum i2c_event event)
     }
 }
 
-int tosa_dac_recv(i2c_slave *s)
+static int tosa_dac_recv(i2c_slave *s)
 {
     printf("%s: recv not supported!!!\n", __FUNCTION__);
     return -1;