MIPS: module: fix incorrect IS_ERR_VALUE macro usages

IS_ERR_VALUE macro should be used only with unsigned long type.
Specifically it works incorrectly with longer types.

The patch follows conclusion from discussion on LKML [1][2].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2120927
[2]: http://permalink.gmane.org/gmane.linux.kernel/2150581

[ralf@linux-mips.org: While it may not immediately be obvious, the type
of st_value in the end is an unsigned long equivalent so the invocation
of IS_ERR_VALUE() was valid but I'm applying the patch anyway for
clarity.]

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12553/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/module-rela.c

@@ -170,7 +170,7 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 		/* This is the symbol it is referring to */
 		sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 			+ ELF_MIPS_R_SYM(rel[i]);
-		if (IS_ERR_VALUE(sym->st_value)) {
+		if (sym->st_value >= -MAX_ERRNO) {
 			/* Ignore unresolved weak symbol */
 			if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
 				continue;

arch/mips/kernel/module.c

@@ -263,7 +263,7 @@ int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
 		/* This is the symbol it is referring to */
 		sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 			+ ELF_MIPS_R_SYM(rel[i]);
-		if (IS_ERR_VALUE(sym->st_value)) {
+		if (sym->st_value >= -MAX_ERRNO) {
 			/* Ignore unresolved weak symbol */
 			if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
 				continue;