Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-476): [#def1]
vim91/src/clipboard.c:2937:16: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘0’
vim91/src/clipboard.c:2880:8: branch_false: following ‘false’ branch...
vim91/src/clipboard.c:2883:20: branch_false: ...to here
vim91/src/clipboard.c:2885:8: branch_false: following ‘false’ branch...
vim91/src/clipboard.c:2888:31: branch_false: ...to here
vim91/src/clipboard.c:2891:8: branch_true: following ‘true’ branch...
vim91/src/clipboard.c:2893:34: branch_true: ...to here
vim91/src/clipboard.c:2896:12: branch_false: following ‘false’ branch...
vim91/src/clipboard.c:2900:13: branch_false: ...to here
vim91/src/clipboard.c:2901:13: release_memory: using NULL here
vim91/src/clipboard.c:2907:8: branch_false: following ‘false’ branch...
vim91/src/clipboard.c:2926:14: branch_false: ...to here
vim91/src/clipboard.c:2926:13: branch_false: following ‘false’ branch...
vim91/src/clipboard.c:2936:9: branch_false: ...to here
vim91/src/clipboard.c:2936:8: branch_true: following ‘true’ branch...
vim91/src/clipboard.c:2937:16: branch_true: ...to here
vim91/src/clipboard.c:2937:16: release_memory: using NULL here
vim91/src/clipboard.c:2937:16: danger: dereference of NULL ‘clip_wl.regular.manager’
# 2935|   #ifdef FEAT_WAYLAND_CLIPBOARD_FS
# 2936|       if (clip_wl.regular.available
# 2937|-> 	    && clip_wl.regular.manager->protocol == VWL_DATA_PROTOCOL_CORE
# 2938|   	    && clip_wl_focus_stealing_available())
# 2939|   	clip_wl.regular.requires_focus = true;

Error: COMPILER_WARNING: [#def2]
vim91/src/if_perlsfio.c: warning: -D_FORTIFY_SOURCE defined but value is too low

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