perf tools: Remove a trailing newline in the event terms

So that it can show the correct encoding info in the JSON output.

$ perf list -j hw
[
{
"Unit": "cpu",
"Topic": "legacy hardware",
"EventName": "branch-instructions",
"EventType": "Kernel PMU event",
"BriefDescription": "Retired branch instructions [This event is an alias of branches]",
"Encoding": "cpu/event=0xc4/"
},
...

Reviewed-by: Ian Rogers <[e-mail]>
Suggested-by: Ian Rogers <[e-mail]>
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/util/pmu.c

···
 			pr_err("Failed to read alias %s\n", name);
 			return ret;
 		}
+		if (line_len >= 1 && alias->terms[line_len - 1] == '\n')
+			alias->terms[line_len - 1] = '\0';
 	}
 	alias->name = strdup(name);
 	alias->desc = desc ? strdup(desc) : NULL;