Quote `$0` in case it contains spaces

License: MIT
Signed-off-by: Mateusz Naściszewski <matin1111@wp.pl>

bin/check_go_version

@@ -25,7 +25,7 @@ UPGRADE_MSG="Please take a look at https://golang.org/doc/install to install or
 
 # Get path to the directory containing this file
 # If $0 has no slashes, uses "./"
-PREFIX=$(expr $0 : "\(.*\/\)") || PREFIX='./'
+PREFIX=$(expr "$0" : "\(.*\/\)") || PREFIX='./'
 # Include the 'check_at_least_version' function
 . ${PREFIX}check_version
 

bin/check_gx_program

@@ -29,7 +29,7 @@ UPGRADE_MSG="$3"
 
 # Get path to the directory containing this file
 # If $0 has no slashes, uses "./"
-PREFIX=$(expr $0 : "\(.*\/\)") || PREFIX='./'
+PREFIX=$(expr "$0" : "\(.*\/\)") || PREFIX='./'
 # Include the 'check_at_least_version' function
 . ${PREFIX}check_version