linker/gensyms: use stderr for displaying error messages
linker/gensyms: use stderr for displaying error messages

Since genlist is used in makefiles and stdout redirected,
if there is an error, you will not see it in make output at
all, instead having things fail in weird ways.

Use fprintf for stderr rather than to stdout to avoid

Change-Id: I947a72bb1ecc33cbecf51f426a5b76664a6dc03b
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>
Signed-off-by: Patrick Williams <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>
Forwardport: yes
Github: See open-power/hostboot#39
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/23180
Tested-by: Jenkins Server
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/23185

Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot