testsuite/ld-riscv-elf/ld-riscv-elf.exp: Fix typo for istarget.

ld/ChangeLog

@@ -1,3 +1,7 @@
+2017-10-25  Hans-Peter Nilsson  <hp@axis.com>
+
+	* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Fix typo for istarget.
+
 2017-10-24  Andrew Waterman  <andrew@sifive.com>
 
 	* ld/testsuite/ld-riscv-elf/c-lui.d: New testcase.

ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp

@@ -19,6 +19,6 @@
 # MA 02110-1301, USA.
 #
 
-if [is_target "riscv-*-*"] {
+if [istarget "riscv-*-*"] {
     run_dump_test "c-lui"
 }