bpo-32150: Expand tabs to spaces in C files. (#4583)

diff --git a/Python/strdup.c b/Python/strdup.c
index 769d3db..99dc774 100644
--- a/Python/strdup.c
+++ b/Python/strdup.c
@@ -5,10 +5,10 @@
 char *
 strdup(const char *str)
 {
-	if (str != NULL) {
-		char *copy = malloc(strlen(str) + 1);
-		if (copy != NULL)
-			return strcpy(copy, str);
-	}
-	return NULL;
+    if (str != NULL) {
+        char *copy = malloc(strlen(str) + 1);
+        if (copy != NULL)
+            return strcpy(copy, str);
+    }
+    return NULL;
 }