[S390] include/asm-s390/: Spelling fixes

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/dasd.h b/include/asm-s390/dasd.h
index 604f68f..3f002e1 100644
--- a/include/asm-s390/dasd.h
+++ b/include/asm-s390/dasd.h
@@ -105,7 +105,7 @@
 } dasd_information_t;
 
 /*
- * Read Subsystem Data - Perfomance Statistics
+ * Read Subsystem Data - Performance Statistics
  */ 
 typedef struct dasd_rssd_perf_stats_t {
 	unsigned char  invalid:1;