modpost: clean up is_executable_section()

SHF_EXECINSTR is a bit flag (#define SHF_EXECINSTR 0x4).
Compare the masked flag to '!= 0'.

There is no good reason to stop modpost immediately even if a special
section index is given. You will get a section mismatch error anyway.

Also, change the return type to bool.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

scripts/mod/modpost.c

@@ -1207,6 +1207,14 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
 	return near;
 }
 
+static bool is_executable_section(struct elf_info *elf, unsigned int secndx)
+{
+	if (secndx > elf->num_sections)
+		return false;
+
+	return (elf->sechdrs[secndx].sh_flags & SHF_EXECINSTR) != 0;
+}
+
 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
 				     const struct sectioncheck* const mismatch,
 				     Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
@@ -1252,14 +1260,6 @@ static void default_mismatch_handler(const char *modname, struct elf_info *elf,
 	}
 }
 
-static int is_executable_section(struct elf_info* elf, unsigned int section_index)
-{
-	if (section_index > elf->num_sections)
-		fatal("section_index is outside elf->num_sections!\n");
-
-	return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
-}
-
 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
 				     const struct sectioncheck* const mismatch,
 				     Elf_Rela* r, Elf_Sym* sym,