parisc: Fix return code of pdc_iodc_print()

There is an off-by-one if the printed string includes a new-line
char.

Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/firmware.c

@@ -1303,7 +1303,7 @@ static char iodc_dbuf[4096] __page_aligned_bss;
  */
 int pdc_iodc_print(const unsigned char *str, unsigned count)
 {
-	unsigned int i;
+	unsigned int i, found = 0;
 	unsigned long flags;
 
 	count = min_t(unsigned int, count, sizeof(iodc_dbuf));
@@ -1315,6 +1315,7 @@ int pdc_iodc_print(const unsigned char *str, unsigned count)
 			iodc_dbuf[i+0] = '\r';
 			iodc_dbuf[i+1] = '\n';
 			i += 2;
+			found = 1;
 			goto print;
 		default:
 			iodc_dbuf[i] = str[i];
@@ -1330,7 +1331,7 @@ int pdc_iodc_print(const unsigned char *str, unsigned count)
 		__pa(pdc_result), 0, __pa(iodc_dbuf), i, 0);
 	spin_unlock_irqrestore(&pdc_lock, flags);
 
-	return i;
+	return i - found;
 }
 
 #if !defined(BOOTLOADER)