psp-fixup-imports: remove one gratuitous level of indentation

there's so many indented blocks, it's hardly possible to read the code even
on a terminal that's been resized to 160 chars wide.

tools/psp-fixup-imports.c

@@ -499,8 +499,7 @@ int load_mapfile(const char *mapfile)
 	struct ImportMap *currmap = NULL;
 	int line = 0;
 
-	if(mapfile != NULL)
-	{
+	if(mapfile == NULL) return ret;
 	do
 	{
 		FILE *fp;
@@ -608,7 +607,6 @@ int load_mapfile(const char *mapfile)
 		}
 	}
 	while(0);
-	}
 
 	return ret;
 }