Fix indentation in string.c

7 spaces were used for 2 levels of indentation. This commit changes it
to use 8 spaces.

string.c

@@ -2117,15 +2117,15 @@ rb_str_times(VALUE str, VALUE times)
 	rb_raise(rb_eArgError, "negative argument");
     }
     if (RSTRING_LEN(str) == 1 && RSTRING_PTR(str)[0] == 0) {
-       str2 = str_alloc(rb_cString);
-       if (!STR_EMBEDDABLE_P(len, 1)) {
-           RSTRING(str2)->as.heap.aux.capa = len;
-           RSTRING(str2)->as.heap.ptr = ZALLOC_N(char, (size_t)len + 1);
-           STR_SET_NOEMBED(str2);
-       }
-       STR_SET_LEN(str2, len);
-       rb_enc_copy(str2, str);
-       return str2;
+        str2 = str_alloc(rb_cString);
+        if (!STR_EMBEDDABLE_P(len, 1)) {
+            RSTRING(str2)->as.heap.aux.capa = len;
+            RSTRING(str2)->as.heap.ptr = ZALLOC_N(char, (size_t)len + 1);
+            STR_SET_NOEMBED(str2);
+        }
+        STR_SET_LEN(str2, len);
+        rb_enc_copy(str2, str);
+        return str2;
     }
     if (len && LONG_MAX/len <  RSTRING_LEN(str)) {
 	rb_raise(rb_eArgError, "argument too big");