Getting rid of clang analyzer warnings.

Thanks to Sean McBride for sharing the warnings.

Change-Id: Ia1526ba45f818fa537186fe4b4e0521f91acf602
Skipping the wasteful and unnecessary inverse sin computation.

Change-Id: Id5e29b59be431cc393295e27b896f9be756bc18d
Cosmetic change to be consistent with file codeing convention.

Change-Id: I77f5fe46cc08a47025e1ff99443522b2c440567e
Merge topic 'vtkPolyLine_clang_analyzer_warning' into master

f86c5f89 Cosmetic change to be consistent with file codeing convention.
cc551eba Skipping the wasteful and unnecessary inverse sin computation.
409086cf Getting rid of clang analyzer warnings.