x86_64: re-add a newline to RESTORE_CONTEXT

RESTORE_CONTEXT lost a newline:
http://www.mail-archive.com/kgdb-bugreport@lists.sourceforge.net/msg00559.html

Reported by Steven M. Christey.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

include/asm-x86_64/system.h

@@ -21,7 +21,7 @@
 
 /* frame pointer must be last for get_wchan */
 #define SAVE_CONTEXT    "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
-#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
+#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\n\t"
 
 #define __EXTRA_CLOBBER  \
 	,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15"