Introduce msg_*warn

Also, unify all outputs of "Warning:" and "Error:" to use normal
capitalization instead of mixing it with all capitals.

Corresponding to flashrom svn r1643.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Idwer Vollering <vidwer@gmail.com>
diff --git a/satasii.c b/satasii.c
index 730c420..ec65bd0 100644
--- a/satasii.c
+++ b/satasii.c
@@ -98,7 +98,7 @@
 
 	/* Check if ROM cycle are OK. */
 	if ((id != 0x0680) && (!(pci_mmio_readl(sii_bar) & (1 << 26))))
-		msg_pinfo("Warning: Flash seems unconnected.\n");
+		msg_pwarn("Warning: Flash seems unconnected.\n");
 
 	if (register_shutdown(satasii_shutdown, NULL))
 		return 1;