debug/elf: Don't crash if line numbers are not available.
From-SVN: r185124
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@ -129,7 +129,7 @@ func openExecutable() {
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// and line number for a PC value.
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func funcFileLine(pc uintptr, function *string, file *string, line *int) bool {
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openExecutable()
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if executable.dwarf == nil {
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if executable == nil || executable.dwarf == nil {
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return false
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}
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f, ln, err := executable.dwarf.FileLine(uint64(pc))
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