dvblast: use double quotes around the Config.in comment

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dvblast/Config.in

@@ -11,6 +11,6 @@ config BR2_PACKAGE_DVBLAST
 
 	  http://www.videolan.org/projects/dvblast.html
 
-comment 'dvblast needs a toolchain w/ NPTL'
+comment "dvblast needs a toolchain w/ NPTL"
 	depends on !BR2_bfin  # libev
 	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL