MIPS: octeon: Fix missed PTR->PTR_WD conversion

Fixes: fa62f39 ("MIPS: Fix build error due to PTR used in more places")
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: tsbogend

arch/mips/cavium-octeon/octeon-memcpy.S

@@ -74,7 +74,7 @@
 #define EXC(inst_reg,addr,handler)		\
 9:	inst_reg, addr;				\
 	.section __ex_table,"a";		\
-	PTR	9b, handler;			\
+	PTR_WD	9b, handler;			\
 	.previous
 
 /*