sparc/sigaction.c: note possible bugs by comments. style fixes
sparc/sigaction.c: note possible bugs by comments. style fixes

no code is actually changed

Signed-off-by: Denys Vlasenko <42afb3a19136e88700e8b77002ea6a5a94c16782@googlemail.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc