[POWERPC] Replace remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/math-emu/stfs.c

@@ -15,7 +15,7 @@ stfs(void *frS, void *ea)
 	int err;
 
 #ifdef DEBUG
-	printk("%s: S %p, ea %p\n", __FUNCTION__, frS, ea);
+	printk("%s: S %p, ea %p\n", __func__, frS, ea);
 #endif
 
 	__FP_UNPACK_D(A, frS);