Fix for memory leak in error case

Rather than leak 40 bytes by failing to free(), just use an automatic variable and let the compiler worry about function exits.
From a tip off in https://www.riscosopen.org/forum/forums/4/topics/3990

Version 0.42. Tagged as 'Gadgets-0_42'

VersionNum

-/* (0.41)
+/* (0.42)
  *
  * This file is automatically maintained by srccommit, do not edit manually.
  * Last processed by srccommit version: 1.1.
  *
  */
-#define Module_MajorVersion_CMHG        0.41
+#define Module_MajorVersion_CMHG        0.42
 #define Module_MinorVersion_CMHG        
-#define Module_Date_CMHG                25 Mar 2016
+#define Module_Date_CMHG                02 May 2016
 
-#define Module_MajorVersion             "0.41"
-#define Module_Version                  41
+#define Module_MajorVersion             "0.42"
+#define Module_Version                  42
 #define Module_MinorVersion             ""
-#define Module_Date                     "25 Mar 2016"
+#define Module_Date                     "02 May 2016"
 
-#define Module_ApplicationDate          "25-Mar-16"
+#define Module_ApplicationDate          "02-May-16"
 
 #define Module_ComponentName            "Gadgets"
 #define Module_ComponentPath            "castle/RiscOS/Sources/Toolbox/Gadgets"
 
-#define Module_FullVersion              "0.41"
-#define Module_HelpVersion              "0.41 (25 Mar 2016)"
-#define Module_LibraryVersionInfo       "0:41"
+#define Module_FullVersion              "0.42"
+#define Module_HelpVersion              "0.42 (02 May 2016)"
+#define Module_LibraryVersionInfo       "0:42"

c/TextMan

@@ -783,6 +783,7 @@ _kernel_oserror *insert_text(Text *text, char *s,
     int             last_line = first_line;
     char            *old_end;
     Scan            scan;
+    int             new_lines[10];
     int             old_split = 0;
     int             old_line_no;
 
@@ -793,16 +794,8 @@ _kernel_oserror *insert_text(Text *text, char *s,
       return make_error(TextGadgets_IntMallocFail, 0);
     }
 
-    scan.new_lines = malloc(10 * sizeof(int));
-
-    /* If the malloc fails */
-    if (scan.new_lines == NULL)
-    {
-      /* return an error message */
-      return make_error(TextGadgets_IntMallocFail, 0);
-    }
-
-    scan.max_line = 9;
+    scan.new_lines = new_lines;
+    scan.max_line = (sizeof(new_lines) / sizeof(new_lines[0])) - 1;
     scan.line_no = 0;
 
     if(left <= str_size)
@@ -907,7 +900,6 @@ _kernel_oserror *insert_text(Text *text, char *s,
      for(i = 0; i < scan.line_no; i++)
         text->line_table[first_line + i] = scan.new_lines[i];
 
-   free(scan.new_lines);
     *first_line_p = first_line;
 
     text->insert_line += ld;