FE: Use safe call when searching for suspend modifier

The modifier does not exist, when the parameter type is typealias.

 #KT-35187 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -6582,6 +6582,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/coroutines"), Pattern.compile("^(.+)\\.kt$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
             }
 
+            @Test
+            @TestMetadata("inlineSuspendTypealias.kt")
+            public void testInlineSuspendTypealias() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/coroutines/inlineSuspendTypealias.kt");
+            }
+
             @Test
             @TestMetadata("modifierFormBuiltinSuspendFun.kt")
             public void testModifierFormBuiltinSuspendFun() throws Exception {