Rename internal function whereis to prompt_user

.. to avoid confustion with whereis(1) from sys-apps/util-linux

defaults/initrd.scripts

@@ -377,7 +377,7 @@ crypt_filter() {
 	fi
 }
 
-whereis(){
+prompt_user(){
 	# $1 = variable whose value is the path (examples: "REAL_ROOT",
 	#      "LUKS_KEYDEV")
 	# $2 = label
@@ -386,7 +386,7 @@ whereis(){
 	eval local oldvalue='$'${1}
 
 	[ \( $# != 2 \) -a \( $# != 3 \) ] && \
-		bad_msg "Bad invocation of function whereis, please file a bug \
+		bad_msg "Bad invocation of function prompt_user, please file a bug \
 		report with this message" && exit 1
 	[ -n "${3}" ] && local explnt=" or : ${3}" || local explnt="."
 	
@@ -771,15 +771,15 @@ openLUKS() {
 			run_shell
 		elif [ ${DEV_ERROR} -eq 1 ]
 		then
-			whereis "LUKS_DEVICE" "${LUKS_NAME}"
+			prompt_user "LUKS_DEVICE" "${LUKS_NAME}"
 			DEV_ERROR=0
 		elif [ ${KEY_ERROR} -eq 1 ]
 		then
-			whereis "LUKS_KEY" "${LUKS_NAME} key"
+			prompt_user "LUKS_KEY" "${LUKS_NAME} key"
 			KEY_ERROR=0
 		elif [ ${KEYDEV_ERROR} -eq 1 ]
 		then
-			whereis "LUKS_KEYDEV" "${LUKS_NAME} key device"
+			prompt_user "LUKS_KEYDEV" "${LUKS_NAME} key device"
 			KEYDEV_ERROR=0
 		else
 			case "${LUKS_DEVICE}" in

defaults/linuxrc

@@ -455,7 +455,7 @@ do
 					good_msg "Detected real_root=${ROOT_DEV}"
 					REAL_ROOT="${ROOT_DEV}"
 				else
-					whereis "REAL_ROOT" "root block device"
+					prompt_user "REAL_ROOT" "root block device"
 					got_good_root=0
 					continue
 				fi
@@ -465,7 +465,7 @@ do
 		if [ "${REAL_ROOT}" = '' ]
 		then
 			# No REAL_ROOT determined/specified. Prompt user for root block device.
-			whereis "REAL_ROOT" "root block device"
+			prompt_user "REAL_ROOT" "root block device"
 			got_good_root=0
 
 		# Check for a block device or /dev/nfs