msi: Simplify check for an empty string (PVS-Studio).

dlls/msi/dialog.c

@@ -2171,7 +2171,7 @@ static void msi_dialog_update_pathedit( msi_dialog *dialog, msi_control *control
 /* FIXME: test when this should fail */
 static BOOL msi_dialog_verify_path( LPWSTR path )
 {
-    if ( !lstrlenW( path ) )
+    if ( !path[0] )
         return FALSE;
 
     if ( PathIsRelativeW( path ) )

dlls/msi/script.c

@@ -356,7 +356,7 @@ DWORD call_script(MSIHANDLE hPackage, INT type, LPCWSTR script, LPCWSTR function
     if (FAILED(hr)) goto done;
 
     /* Call a function if necessary through the IDispatch interface */
-    if (function != NULL && strlenW(function) > 0) {
+    if (function && function[0]) {
         TRACE("Calling function %s\n", debugstr_w(function));
 
         hr = IActiveScript_GetScriptDispatch(pActiveScript, NULL, &pDispatch);

dlls/msi/tests/action.c

@@ -2715,7 +2715,7 @@ static void check_reg_str(HKEY prodkey, LPCSTR name, LPCSTR expected, BOOL bcase
     }
 
     if (!expected)
-        ok_(__FILE__, line)(lstrlenA(val) == 0, "Expected empty string, got %s\n", val);
+        ok_(__FILE__, line)(!val[0], "Expected empty string, got %s\n", val);
     else
     {
         if (bcase)

dlls/msi/tests/db.c

@@ -4534,7 +4534,7 @@ static void test_update(void)
     size = MAX_PATH;
     r = MsiRecordGetStringA(rec, 1, result, &size);
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
-    ok(!lstrlenA(result), "Expected an empty string, got %s\n", result);
+    ok(!result[0], "Expected an empty string, got %s\n", result);
 
     MsiCloseHandle(rec);
 
@@ -4580,7 +4580,7 @@ static void test_update(void)
     size = MAX_PATH;
     r = MsiRecordGetStringA(rec, 1, result, &size);
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
-    ok(!lstrlenA(result), "Expected an empty string, got %s\n", result);
+    ok(!result[0], "Expected an empty string, got %s\n", result);
 
     MsiCloseHandle(rec);
 

dlls/msi/tests/package.c

@@ -2194,7 +2194,7 @@ static void test_props(void)
     sz = 6;
     r = MsiGetPropertyA(hpkg, "property", buffer, &sz);
     ok( r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
-    ok( !strlen(buffer), "Expected empty string, got %s\n", buffer);
+    ok(!buffer[0], "Expected empty string, got %s\n", buffer);
 
     MsiCloseHandle( hpkg );
     DeleteFileA(msifile);
@@ -2347,7 +2347,7 @@ static void test_property_table(void)
     lstrcpyA(buffer, "aaa");
     r = MsiGetPropertyA(hpkg, "dantes", buffer, &sz);
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);
-    ok(lstrlenA(buffer) == 0, "Expected empty string, got %s\n", buffer);
+    ok(!buffer[0], "Expected empty string, got %s\n", buffer);
 
     r = MsiSetPropertyA(hpkg, "dantes", "mercedes");
     ok(r == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", r);

dlls/msi/tests/source.c

@@ -176,7 +176,7 @@ static void check_reg_str(HKEY prodkey, LPCSTR name, LPCSTR expected, BOOL bcase
     }
 
     if (!expected)
-        ok_(__FILE__, line)(lstrlenA(val) == 0, "Expected empty string, got %s\n", val);
+        ok_(__FILE__, line)(!val[0], "Expected empty string, got %s\n", val);
     else
     {
         if (bcase)