drivers/char/toshiba.c: make a function static

@@ -407,7 +407,7 @@
  *   laptop, otherwise zero and determines the Machine ID, BIOS version and
  *   date, and SCI version.
  */
-int tosh_probe(void)
+static int tosh_probe(void)
 {
 	int i,major,minor,day,year,month,flag;
 	unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };