perf bpf: Use ERR_CAST instead of ERR_PTR(PTR_ERR())
Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...)). This makes it more readable and also fix this warning detected by err_cast.cocci: tools/perf/util/bpf-loader.c:1606:11-18: WARNING: ERR_CAST can be used with op Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Julia Lawall <julia.lawall@lip6.fr> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wen Yang <yellowriver2010@hotmail.com> Cc: zhong.weidong@zte.com.cn Link: http://lkml.kernel.org/r/20181127090610.28488-1-wen.yang99@zte.com.cnSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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