[POWERPC] fix spin lock nesting in hvc_iseries

We had nested spinlocks using the same flags variable, but it turns out
that we don't need the nested locks at all (the lock protects a static
buffer that we aren't using here), so just remove the extra locks.

Spotted by Alexey Dobriyan.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

drivers/char/hvc_iseries.c

@@ -153,9 +153,7 @@ static int put_chars(uint32_t vtermno, const char *buf, int count)
 	spin_lock_irqsave(&consolelock, flags);
 
 	if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
-		spin_lock_irqsave(&consoleloglock, flags);
 		HvCall_writeLogBuffer(buf, count);
-		spin_unlock_irqrestore(&consoleloglock, flags);
 		sent = count;
 		goto done;
 	}
@@ -171,11 +169,8 @@ static int put_chars(uint32_t vtermno, const char *buf, int count)
 
 		len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
 
-		if (viochar_is_console(pi)) {
+		if (viochar_is_console(pi))
-			spin_lock_irqsave(&consoleloglock, flags);
 			HvCall_writeLogBuffer(buf, len);
-			spin_unlock_irqrestore(&consoleloglock, flags);
-		}
 
 		init_data_event(viochar, pi->lp);