[gegl] string: fix typo strech=stretch, spotted by Anders Jonsson

[Øyvind Kolås <ok src gnome org>]

commit 7008ab635d504e737b1313798dff663a751c90e5
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Dec 6 20:19:11 2016 +0100

    string: fix typo strech=stretch, spotted by Anders Jonsson
    
    see bug #775494

 operations/common/sinus.c                |    2 +-
 operations/common/stretch-contrast-hsv.c |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/operations/common/sinus.c b/operations/common/sinus.c
index aa3a946..2dddc71 100644
--- a/operations/common/sinus.c
+++ b/operations/common/sinus.c
@@ -71,7 +71,7 @@ property_enum (blend_mode, _("Blend Mode"),
     GEGL_SINUS_BLEND_SINUSOIDAL)
 
 property_double (blend_power, _("Exponent"), 0.0)
-    description (_("Power used to strech the blend"))
+    description (_("Power used to stretch the blend"))
     value_range (-7.5, 7.5)
 
 property_int    (width, _("Width"), 1024)
diff --git a/operations/common/stretch-contrast-hsv.c b/operations/common/stretch-contrast-hsv.c
index a170972..be56647 100644
--- a/operations/common/stretch-contrast-hsv.c
+++ b/operations/common/stretch-contrast-hsv.c
@@ -41,7 +41,7 @@ typedef struct {
 } AutostretchData;
 
 static void
-buffer_get_auto_strech_data (GeglBuffer      *buffer,
+buffer_get_auto_stretch_data (GeglBuffer      *buffer,
                              AutostretchData *data)
 {
   gfloat smin =  G_MAXFLOAT;
@@ -141,7 +141,7 @@ process (GeglOperation       *operation,
   AutostretchData     data;
   GeglBufferIterator *gi;
 
-  buffer_get_auto_strech_data (input, &data);
+  buffer_get_auto_stretch_data (input, &data);
   clean_autostretch_data (&data);
 
   gi = gegl_buffer_iterator_new (input, result, 0, babl_format ("HSVA float"),