fix missing comma in sh setjmp asm

this typo did not result in an erroneous setjmp with at least binutils
2.22 but fix it for clarity and compatibility with potentially stricter
sh assemblers.

src/setjmp/sh/setjmp.s

@@ -13,7 +13,7 @@ setjmp:
 	fmov.s fr13, @-r4
 	fmov.s fr12, @-r4
 	sts.l  pr,   @-r4
-	mov.l  r15   @-r4
+	mov.l  r15,  @-r4
 	mov.l  r14,  @-r4
 	mov.l  r13,  @-r4
 	mov.l  r12,  @-r4