configure --with-nss: drop redundant if statement

configure.ac

@@ -2145,9 +2145,6 @@ if test "$curl_ssl_msg" = "$init_ssl_msg"; then
       nssprefix=$OPT_NSS
     fi
 
-    # the following check is always satisfied
-    if test -n "$addlib"; then
-
     CLEANLDFLAGS="$LDFLAGS"
     CLEANLIBS="$LIBS"
     CLEANCPPFLAGS="$CPPFLAGS"
@@ -2189,9 +2186,8 @@ if test "$curl_ssl_msg" = "$init_ssl_msg"; then
         export LD_LIBRARY_PATH
         AC_MSG_NOTICE([Added $nssprefix/lib$libsuff to LD_LIBRARY_PATH])
       fi
-      fi
 
-    fi
+    fi dnl NSS found
 
   fi dnl NSS not disabled