typo fixes: occuring -> occurring

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/include/asm-ia64/sn/tioca_provider.h b/include/asm-ia64/sn/tioca_provider.h
index ab7fe24..65cdd73 100644
--- a/include/asm-ia64/sn/tioca_provider.h
+++ b/include/asm-ia64/sn/tioca_provider.h
@@ -27,7 +27,7 @@
 #define PV908234 (1 << 1)
   /* CA:AGPDMA write request data mismatch with ABC1CL merge */
 #define PV895469 (1 << 1)
-  /* TIO:CA TLB invalidate of written GART entries possibly not occuring in CA*/
+  /* TIO:CA TLB invalidate of written GART entries possibly not occurring in CA*/
 #define PV910244 (1 << 1)
 
 struct tioca_dmamap{