sane.ds: Make some functions static.
diff --git a/dlls/sane.ds/capability.c b/dlls/sane.ds/capability.c
index 6b6867e..615e4cb 100644
--- a/dlls/sane.ds/capability.c
+++ b/dlls/sane.ds/capability.c
@@ -31,6 +31,8 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(twain);
 
+static TW_UINT16 SANE_ICAPXferMech (pTW_CAPABILITY pCapability, TW_UINT16 action);
+
 TW_UINT16 SANE_SaneCapability (pTW_CAPABILITY pCapability, TW_UINT16 action)
 {
     TW_UINT16 twCC = TWCC_SUCCESS;
@@ -205,7 +207,7 @@
 }
 
 /* ICAP_XFERMECH */
-TW_UINT16 SANE_ICAPXferMech (pTW_CAPABILITY pCapability, TW_UINT16 action)
+static TW_UINT16 SANE_ICAPXferMech (pTW_CAPABILITY pCapability, TW_UINT16 action)
 {
     TRACE("ICAP_XFERMECH\n");