Fixing bash conditionals.

Author: landhb

ct.sh

@@ -38,12 +38,12 @@ if [ "$TRAVIS_RUST_VERSION" == "stable" ] || [ "$TRAVIS_RUST_VERSION" == "beta"
         cargo test --features dsa --target $TARGET
 
         # If zlib is installed, test the zlib feature
-        if [ -n $ZLIB_INSTALLED ]; then
+        if [ -n "$ZLIB_INSTALLED" ]; then
             cargo test --features zlib --target $TARGET
         fi
 
         # If AES-NI is supported, test the feature
-        if [ -n $AES_NI_SUPPORT ]; then
+        if [ -n "$AES_NI_SUPPORT" ]; then
             cargo test --features force_aesni_support --target $TARGET
         fi
     else