Descriptioncmd/cgo: doc updates
1. note that to use C.free <stdlib.h> must be included
2. can also extract errno from a void C function
Patch Set 1 #Patch Set 2 : diff -r ac06fe42df6d https://code.google.com/p/go/ #Patch Set 3 : diff -r 7dc8d66efb6d https://code.google.com/p/go/ #Patch Set 4 : diff -r 7dc8d66efb6d https://code.google.com/p/go/ #Patch Set 5 : diff -r 5f4d7142d74e https://code.google.com/p/go/ #MessagesTotal messages: 3
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