perf probe: Fix uninitialized variable

Since the linked fixes: commit, err is returned uninitialized due to the
removal of "return 0". Initialize err to fix it.

This fixes the following intermittent test failure on release builds:

 $ perf test "testsuite_probe"
 ...
 -- [ FAIL ] -- perf_probe :: test_invalid_options :: mutually exclusive options :: -L foo -V bar (output regexp parsing)
 Regexp not found: \"Error: switch .+ cannot be used with switch .+\"
 ...

Fixes: 080e47b ("perf probe: Introduce quotation marks support")
Tested-by: Namhyung Kim <[email protected]>
Reviewed-by: Arnaldo Carvalho de Melo <[email protected]>
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: James Clark <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: james-c-linaro

tools/perf/util/probe-event.c

@@ -1370,7 +1370,7 @@ int parse_line_range_desc(const char *arg, struct line_range *lr)
 {
 	char *buf = strdup(arg);
 	char *p;
-	int err;
+	int err = 0;
 
 	if (!buf)
 		return -ENOMEM;