[gimp] Initialize variables that are not initialized to silence warnings.

[Jehan <jehanp src gnome org>]

commit 3dfb3647d4a2c35ddf2059f9f2d0b90968c0ab98
Author: sonia habtiche <habtichesonia2000 gmail com>
Date:   Wed Mar 23 23:08:59 2022 +0000

    Initialize variables that are not initialized to silence warnings.
    
    Committer's (Jehan) note: with clang version 12.0.0 on macOS Big Sur,
    it seems that warnings such as the following are outputted:
    
    > plug-ins/file-psd/psd-load.c:447:32: warning: variable 'block_len' is uninitialized when used here 
[-Wuninitialized]
    >   block_len = GUINT32_FROM_BE (block_len);
    
    > plug-ins/file-psd/psd-load.c:2312:34: note: initialize the variable 'comp_mode' to silence this warning
    >   guint16               comp_mode;

 plug-ins/file-psd/psd-load.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/plug-ins/file-psd/psd-load.c b/plug-ins/file-psd/psd-load.c
index a72fe688ce..985217195c 100644
--- a/plug-ins/file-psd/psd-load.c
+++ b/plug-ins/file-psd/psd-load.c
@@ -434,8 +434,8 @@ read_color_mode_block (PSDimage      *img_a,
                        GInputStream  *input,
                        GError       **error)
 {
-  static guchar cmap[] = { 0, 0, 0, 255, 255, 255 };
-  guint32       block_len;
+  static guchar cmap[]    = { 0, 0, 0, 255, 255, 255 };
+  guint32       block_len = 0;
 
   img_a->color_map_entries = 0;
   img_a->color_map_len = 0;
@@ -522,7 +522,7 @@ read_image_resource_block (PSDimage      *img_a,
                            GInputStream  *input,
                            GError       **error)
 {
-  guint64 block_len;
+  guint64 block_len = 0;
   guint64 block_end;
 
   if (psd_read (input, &block_len, 4, error) < 4)
@@ -2309,7 +2309,7 @@ add_merged_image (GimpImage     *image,
   PSDchannel            chn_a[MAX_CHANNELS];
   gchar                *alpha_name;
   guchar               *pixels;
-  guint16               comp_mode;
+  guint16               comp_mode = 0;
   guint16               base_channels;
   guint16               extra_channels;
   guint16               total_channels;