s390/ptrace: fix coding style

Reported-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/ptrace.h

@@ -76,8 +76,7 @@ enum {
  * The pt_regs struct defines the way the registers are stored on
  * the stack during a system call.
  */
-struct pt_regs 
-{
+struct pt_regs {
 	union {
 		user_pt_regs user_regs;
 		struct {