perf tools: Add missing newline to expr parser error messages

Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170724234015.5165-6-andi@firstfloor.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/expr.y

@@ -62,7 +62,7 @@ all_expr: expr			{ *final_val = $1; }
 
 expr:	  NUMBER
 	| ID			{ if (lookup_id(ctx, $1, &$$) < 0) {
-					pr_debug("%s not found", $1);
+					pr_debug("%s not found\n", $1);
 					YYABORT;
 				  }
 				}