Apply suggestions from code review

Co-authored-by: Saleem Abdulrasool <compnerd@compnerd.org>

Author: 3405691582

cmake/modules/SwiftConfigureSDK.cmake

@@ -405,7 +405,7 @@ macro(configure_sdk_unix name architectures)
 
         set(SWIFT_SDK_OPENBSD_ARCH_amd64_TRIPLE "amd64-unknown-openbsd${openbsd_system_version}")
 
-	if(NOT CMAKE_SYSROOT STREQUAL "")
+	if(CMAKE_SYSROOT)
 	  set(SWIFT_SDK_OPENBSD_ARCH_${arch}_PATH "${CMAKE_SYSROOT}${SWIFT_SDK_OPENBSD_ARCH_${arch}_PATH}" CACHE INTERNAL "sysroot path" FORCE)
 	  set(SWIFT_SDK_OPENBSD_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY "${CMAKE_SYSROOT}${SWIFT_SDK_OPENBSD_ARCH_${arch}_LIBC_INCLUDE_DIRECTORY}" CACHE INTERNAL "sysroot libc path" FORCE)
 	endif()

utils/build-script-impl

@@ -1606,7 +1606,7 @@ for host in "${ALL_HOSTS[@]}"; do
             )
         fi
 
-        if [[ "${host}" == "openbsd-"* && "${OPENBSD_USE_TOOLCHAIN_FILE}" != "" ]]; then
+        if [[ "${host}" == "openbsd-"* && -n "${OPENBSD_USE_TOOLCHAIN_FILE}" ]]; then
             llvm_cmake_options=(
                 "${llvm_cmake_options[@]}"
                 -DCMAKE_TOOLCHAIN_FILE="${OPENBSD_USE_TOOLCHAIN_FILE}"
@@ -1894,7 +1894,7 @@ for host in "${ALL_HOSTS[@]}"; do
                     )
                 fi
 
-                if [[ $(is_cross_tools_host ${host}) && "${host}" == "openbsd-"* && "${OPENBSD_USE_TOOLCHAIN_FILE}" != "" ]]; then
+                if [[ $(is_cross_tools_host ${host}) && "${host}" == "openbsd-"* && -n "${OPENBSD_USE_TOOLCHAIN_FILE}" ]]; then
                     cmake_options=(
                         "${cmake_options[@]}"
                         -DCMAKE_TOOLCHAIN_FILE="${OPENBSD_USE_TOOLCHAIN_FILE}"