Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-688): [#def1]
kexec-tools-2.0.31/kexec/kexec.c:1305:9: warning[-Wanalyzer-null-argument]: use of NULL where non-null expected
kexec-tools-2.0.31/kexec/kexec.c:1289:6: enter_function: entry to ‘cmdline_add_liveupdate’
kexec-tools-2.0.31/kexec/kexec.c:1296:12: branch_false: following ‘false’ branch...
kexec-tools-2.0.31/kexec/kexec.c:1299:9: branch_false: ...to here
kexec-tools-2.0.31/kexec/kexec.c:1304:15: call_function: calling ‘xmalloc’ from ‘cmdline_add_liveupdate’
kexec-tools-2.0.31/kexec/kexec.c:1304:15: return_function: returning to ‘cmdline_add_liveupdate’ from ‘xmalloc’
kexec-tools-2.0.31/kexec/kexec.c:1305:9: danger: argument 1 (‘xmalloc(len)’) NULL where non-null expected
# 1303|   	len = strlen(*base) + strlen(buf) + 1;
# 1304|   	str = xmalloc(len);
# 1305|-> 	sprintf(str, "%s%s", *base, buf);
# 1306|   	*base = str;
# 1307|   }

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