Fix shellcheck warnings

Author: Felixoid

scripts/lint.sh

@@ -4,23 +4,23 @@ if [ -z ${PKG+x} ]; then echo "PKG is not set"; exit 1; fi
 if [ -z ${ROOT_DIR+x} ]; then echo "ROOT_DIR is not set"; exit 1; fi
 
 echo "gofmt:"
-OUT=$(gofmt -l -s $ROOT_DIR 2>&1 | grep --invert-match -E "(/(example|vendor))")
+OUT=$(gofmt -l -s "$ROOT_DIR" 2>&1 | grep --invert-match -E "(/(example|vendor))")
 if [ -n "$OUT" ]; then echo "$OUT"; PROBLEM=1; fi
 
 echo "errcheck:"
-OUT=$(errcheck $PKG/... 2>&1 | grep --invert-match -E "(/(example|vendor))")
+OUT=$(errcheck "$PKG/..." 2>&1 | grep --invert-match -E "(/(example|vendor))")
 if [ -n "$OUT" ]; then echo "$OUT"; PROBLEM=1; fi
 
 echo "go vet:"
-OUT=$(go vet -all=true $ROOT_DIR 2>&1 | grep --invert-match -E "(Checking file|\%p of wrong type|can't check non-constant format|/example|/vendor)")
+OUT=$(go vet -all=true "$ROOT_DIR" 2>&1 | grep --invert-match -E "(Checking file|\%p of wrong type|can't check non-constant format|/example|/vendor)")
 if [ -n "$OUT" ]; then echo "$OUT"; PROBLEM=1; fi
 
 echo "golint:"
 OUT=$(golint ./... 2>&1 | grep --invert-match -E "(^(example|vendor))")
 if [ -n "$OUT" ]; then echo "$OUT"; PROBLEM=1; fi
 
 echo "staticcheck:"
-OUT=$(staticcheck $PKG/... 2>&1 | grep --invert-match -E "((example|vendor)/)")
+OUT=$(staticcheck "$PKG/..." 2>&1 | grep --invert-match -E "((example|vendor)/)")
 if [ -n "$OUT" ]; then echo "$OUT"; PROBLEM=1; fi
 
 if [ -n "$PROBLEM" ]; then exit 1; fi