perf symbols: Remove unused variable 'err'

Variable 'err' is defined but never used in function symsrc__init(),
remove it and directly return -1 at the end of the function.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190530093801.20510-1-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/symbol-elf.c

@@ -699,7 +699,6 @@ bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr)
 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
 		 enum dso_binary_type type)
 {
-	int err = -1;
 	GElf_Ehdr ehdr;
 	Elf *elf;
 	int fd;
@@ -793,7 +792,7 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
 	elf_end(elf);
 out_close:
 	close(fd);
-	return err;
+	return -1;
 }
 
 /**