[ptxdist] [PATCH] rootfs: Fix handling of empty variables

[Sascha Hauer <s.hauer@pengutronix.de>]

$(PTXCONF_PROJECT_VENDOR) and $(PTXCONF_ROOTFS_ETC_HOSTNAME) can be
empty variables in which case bash answers with:

/bin/bash: command substitution: line 0: syntax error near unexpected token `newline'
/bin/bash: command substitution: line 0: `sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< '

Fix this warning by putting the variables into quotation marks to make
the empty string explicit.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 rules/rootfs.make | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rules/rootfs.make b/rules/rootfs.make
index 419ca001e..627d33463 100644
--- a/rules/rootfs.make
+++ b/rules/rootfs.make
@@ -217,11 +217,11 @@ ifdef PTXCONF_ROOTFS_ISSUE
 		$(call remove_quotes,$(PTXCONF_ROOTFS_ETC_HOSTNAME)))
 	@$(call install_replace_figlet, rootfs, /etc/issue, \
 		@FIGLET:VENDOR@, \
-		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< $(PTXCONF_PROJECT_VENDOR)`, \
+		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< "$(PTXCONF_PROJECT_VENDOR)"`, \
 		etcissue)
 	@$(call install_replace_figlet, rootfs, /etc/issue, \
 		@FIGLET:HOSTNAME@, \
-		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< $(PTXCONF_ROOTFS_ETC_HOSTNAME)`, \
+		`sed -r 's/ ?([\.:;,]) ?/ \1 /' <<< "$(PTXCONF_ROOTFS_ETC_HOSTNAME)"`, \
 		etcissue)
 endif
 
-- 
2.20.1


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